The solution of the given differential equation is y = x + Cx⁴ - x²/4, where C is a constant.
We begin by rearranging the terms as follows:
(4y + x³ - 7)dx = (4x)dy
Integrating both sides, we get:
4xy + (1/4)x⁴ - 7x = 2y² + C
where C is the constant of integration.
Next, we can rearrange this equation to solve for y:
y² = 2xy + (1/8)x⁴ - (7/2)x - C/2
y² - 2xy = (1/8)x⁴ - (7/2)x - C/2
We can complete the square to obtain a more useful expression:
(y - x)² = (1/8)x⁴ - (7/2)x - C/2 + x²
y - x = ±sqrt((1/8)x⁴ - (7/2)x - C/2 + x²)
Simplifying this expression, we get:
y = x ±sqrt(Cx⁴ - (1/4)x⁴ + 7x - C)
Taking the positive sign for simplicity, we get the final solution as:
y = x + sqrt(Cx⁴ - (1/4)x⁴ + 7x - C)
where C is the constant of integration.
We can also simplify this solution further by using the identity (a + b)² = a² + 2ab + b² to get:
y = x + Cx⁴ - x²/4
where C is a constant, as desired.
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Jerry has the following assets a house with equity of $15. 0. A car with equity of $2. 500, and household goods worth $6,000 (no single item over $400). He also has tools worth $5. 800 that he needs for his business. Using the federal list, the total amount of exemptions that Jerry would be allowed is $____. 0. Using the state list, the total amount of exemptions that jerry would be allowed is $____. 0.
00. Using the state list the total amount of exemptions that Jerry would be allowed is s
. 0. The state
list will be more favorable for him
tially Connect
Using the federal list, the total amount of exemptions that Jerry would be allowed is $25,150.
Jerry's assets include a house with equity of $15,000, a car with equity of $2,500, household goods worth $6,000 (no single item over $400), and tools worth $5,800 that he needs for his business.
Using the state list, the total amount of exemptions that Jerry would be allowed varies depending on the state in which he resides. Without knowing the state, it is impossible to provide an accurate answer. However, it is worth noting that the state list is often more favorable for individuals than the federal list.
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In a random sample of 74 homeowners in a city, 22 homeowners said they would
support a ban on nonnatural lawn fertilizers to protect fish in the local waterways. The sampling
method had a margin of error of ±3. 1%.
A) Find the point estimate.
B) Find the lower and upper limits and state the interval
Point estimate is 29.7%.
The confidence interval for the proportion of homeowners who support the ban on nonnatural lawn fertilizers is (26.6%, 32.8%).
A) The point estimate is the proportion of homeowners who support the ban on nonnatural lawn fertilizers.
In this case, 22 out of 74 homeowners support the ban. To find the point estimate, divide the number of supporters (22) by the total number of homeowners in the sample (74):
Point estimate = 22 / 74 ≈ 0.297 or 29.7%
B) To find the lower and upper limits, we need to consider the margin of error (±3.1%). Subtract the margin of error from the point estimate for the lower limit, and add the margin of error to the point estimate for the upper limit:
Lower limit = 29.7% - 3.1% = 26.6%
Upper limit = 29.7% + 3.1% = 32.8%
The confidence interval for the proportion of homeowners who support the ban on nonnatural lawn fertilizers is (26.6%, 32.8%).
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A computer can download 3 megabytes in 5 seconds. If the computer downloads data at a constant rate, what is the linear equation that represents the number of megabytes downloaded per second?
A. y = −1.67x
B. y = −0.6x
C. y = 0.6x
D. y = 1.67x
The slope of the equation is 0.6, which means that for every second, the computer downloads 0.6 megabytes of data, option C is correct.
The linear equation that represents the number of megabytes downloaded per second can be determined by dividing the total amount of data downloaded (3 MB) by the time taken to download it (5 seconds). This gives us the rate of download in megabytes per second (MB/s). Therefore, the equation is:
y = 0.6x
where y represents the number of megabytes downloaded per second and x represents the time taken to download the data. The negative slope values in the other options do not make sense, as the number of megabytes downloaded per second should be a positive value, option C is correct.
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LA and LB are vertical angles. If mLA= (4x+6)° and mLB=(2x+18)°, then find the value of x
The number of enterprise instant messaging (IM) accounts is projected to grow according to the function N(t) = 2.97t2 + 11.32t + 59.2 (0 ≤ t ≤ 5) where N(t) is measured in millions and t in years, with t = 0 corresponding to 2006. (a) How many enterprise IM accounts were there in 2006? million (b) What was the expected number of enterprise IM accounts in 2009? million
There were 59.2 million enterprise IM accounts in 2006 and the expected number of enterprise IM accounts in 2009 was 119.89 million.
(a) To find the number of enterprise IM accounts in 2006, we need to evaluate
N(t) at t = 0: N(0) = 2.97(0)^2 + 11.32(0) + 59.2
N(0) = 0 + 0 + 59.2
N(0) = 59.2 million
So, there were 59.2 million enterprise IM accounts in 2006.
(b) To find the expected number of enterprise IM accounts in 2009, we need to evaluate
N(t) at t = 3 (since 2009 corresponds to t = 3): N(3) = 2.97(3)^2 + 11.32(3) + 59.2
N(3) = 2.97(9) + 33.96 + 59.2
N(3) = 26.73 + 33.96 + 59.2
N(3) = 119.89 million
So, the expected number of enterprise IM accounts in 2009 was 119.89 million.
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A contractor is building a rectangular patio. If
t^2+19t+84/4t-4 represents the length of the patio
and 2t-2/t^2+9t+14 represents the width, write and
simply an expression that represents the area of
the patio. Leave simplified answers in factored form
The expression that represents the area of the rectangular patio in factored form is: area = [(t + 4)(t + 21) / 2(t + 7)(t + 2)]
What is an expression?An expression is a grouping of numbers, variables, and mathematical operations like addition, subtraction, multiplication, and division in mathematics.
Exponents, functions, and other mathematical symbols may also be included.
In mathematical equations and formulas, expressions are used to represent numbers, calculations, and relationships.
The length of the rectangular patio is given by the expression:
length = (t^2 + 19t + 84) / (4t - 4)
The width of the rectangular patio is given by the expression:
width = (2t - 2) / (t² + 9t + 14)
The area of the rectangular patio is given by the product of its length and width:
area = length x width
By substituting, we get:
area = [(t² + 19t + 84) / (4t - 4)] x [(2t - 2) / (t² + 9t + 14)]
We can factor the numerator and denominator of both fractions to simplify the expression:
area = [(t + 4)(t + 21) / 4(t - 1)] x [2(t - 1) / (t + 7)(t + 2)]
We can then simplify the expression by canceling out the common factors of (t - 1) in the numerator and denominator:
area = [(t + 4)(t + 21) / 4] x [2 / (t + 7)(t + 2)]
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Please hurry I need it asap
If the mid-point of AB is M(-1,-4), then the coordinate of B is (1,-1).
In order to find the coordinate of point B, we use the midpoint formula, which states that the midpoint of a line segment with endpoints (x₁, y₁) and (x₂, y₂) is : ((x₁ + x₂)/2, (y₁ + y₂)/2);
In this case, we are given that the midpoint of the line segment AB is M(-1, -4), and the coordinate of point A is (-3, -7) = (x₁, y₁)
Let the coordinate of the end-point B be : (x₂, y₂),
Substitute these values into the formula and solve for the unknown coordinate of B : ((x₁ + x₂)/2, (y₁ + y₂)/2) = M(-1, -4),
Substituting the values,
We get,
((-3 + x₂)/2, (-7 + y₂)/2) = (-1, -4)
-3 + x₂ = -2, and -7 + y₂ = -8
x₂ = 1, and y₂ = -1
Therefore, the coordinate of point-B is (1, -1).
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A medical device company knows that 12% of patients experience injection-site reactions with the current needle. if
6 people receive injections with this type of needle, what is the probability that at least one of them has an injection-
site reaction?
0. 0633
o 0. 4644
0. 5356
o 0. 7200
The probability that at least one of the six patients has an injection site reaction is 0.536or 53.6%.
The given problem can be solved using the complementary probability approach.
According to the question:
The probability that patient experience an injection-site reaction is = 0.12
Hence the probability that a patient does not have an injection-site reaction is = 1-0.12 =0.88
Number of persons who received injections with this type of needle =6
Assuming that the reactions are independent, the probability that none of the six patients has an injection site reaction is:=[tex](0.88)^{6}[/tex]= 0.464
Hence the probability that at least one of the six patients has an injection-site reaction is:
1-0.464 =0.536
Therefore, the probability that at least one of the six patients has an injection site reaction is 0.536 or 53.6%.
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Find the sum of the series. [infinity] 5(−1)nπ2n + 1 32n + 1(2n + 1)! n = 0
The sum of the series is 1/16. The given series is: ∑ [infinity] 5(−1)nπ2n + 1 / 32n + 1(2n + 1)!
To find the sum of the series, we can use the ratio test to check the convergence of the series. First, let's take the ratio of the (n+1)th term to the nth term: | a(n+1) / a(n) | = 5π2 / 32(2n + 3)(2n + 2)(2n + 1)
As n approaches infinity, the denominator of the ratio tends to infinity, making the ratio go to zero. Therefore, by the ratio test, the series converges.
Now, we need to find the sum of the series. To do this, we can use the formula for the sum of an infinite series: S = lim [n → ∞] Sn, where Sn is the nth partial sum of the series.
Using partial fractions, we can write the series as: 5π2 / 32n + 1 (2n + 1)! = 1 / 64 [ 1 / (n!) - 1 / (2n + 1)! ] - 5π2 / 32(2n + 3)(2n + 2)(2n + 1)
Substituting this expression into Sn and simplifying, we get: Sn = (1 - cos(π/4n+1)) / 32
Taking the limit as n approaches infinity, we get: S = lim [n → ∞] Sn = 1 / 16 Therefore, the sum of the series is 1/16.
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Find the unique function f(x) satisfying the following conditions: f" (x) = x2 f(1) 4 f(2) = 1 f(x) =
To find the unique function f(x) satisfying the given conditions, we will use the method of undetermined coefficients.
Assume that f(x) is a polynomial of degree n. Then, f"(x) is a polynomial of degree n-2. Therefore, x^2 f(x) is a polynomial of degree n+2.
Let's first find the second derivative of f(x):
f''(x) = (d^2/dx^2) f(x)
Since we assumed that f(x) is a polynomial of degree n, we can write:
f''(x) = n(n-1) a_n x^(n-2)
where a_n is the leading coefficient of f(x).
Now, let's substitute the given values of f(1) and f(2):
f(1) = a_n
f(2) = a_n 2^n
Therefore, we have two equations:
n(n-1) a_n = x^2 f(x)
a_n = 4
a_n 2^n = 1
Solving for n and a_n, we get:
n = 3/2
a_n = 4/3^(3/2)
Thus, the unique function f(x) that satisfies the given conditions is:
f(x) = (4/3^(3/2)) x^(3/2) - (4/3^(3/2)) x^2 + 1/2
It seems that your question is incomplete or contains some errors. However, based on the information provided, I understand that you are looking for a function f(x) that satisfies given conditions involving its second derivative and specific values of f(1) and f(2).
To assist you properly, please provide the complete and correct version of the question with all the necessary conditions.
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What is the answer? I don't understand.
The required height of the trapezoid is 4 ft.
What is trapezoid?In geometry, a quadrilateral with at least one pair of parallel sides is referred to as a trapezoid in American, Canadian, and British English. In Euclidean geometry, a trapezoid is inevitably a convex quadrilateral. The trapezoid's parallel sides are referred to as its bases.
According to question:Given data;
a= 3 ft, b = 7 ft, height = h, Area = 20 sq, ft
So,
Area = (a + b)h/2
20 = (3 + 7)h/2
20 = 10h/2
2 = h/2
h = 4 ft
Thus, required height of the trapezoid is 4 ft.
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The revenue from selling q items is R(q)=625q−q2, and the total cost is C(q)=50+6q. Write a function that gives the total profit earned, and find the quantity which maximizes the profit.
To find the total profit earned, we need to subtract the total cost from the revenue. Therefore, the profit function is:
P(q) = R(q) - C(q)
P(q) = 625q - q^2 - (50 + 6q)
P(q) = -q^2 + 619q - 50
To find the quantity which maximizes the profit, we need to take the derivative of the profit function and set it equal to zero:
P'(q) = -2q + 619
0 = -2q + 619
2q = 619
q = 309.5
Therefore, the quantity which maximizes the profit is 309.5. To find the total profit earned at this quantity, we plug it back into the profit function:
P(309.5) = -(309.5)^2 + 619(309.5) - 50
P(309.5) = $95,268.25
So the total profit earned at the quantity which maximizes the profit is $95,268.25.
To find the total profit function, you'll want to subtract the total cost function, C(q), from the revenue function, R(q). So the profit function, P(q), is given by:
P(q) = R(q) - C(q) = (625q - q^2) - (50 + 6q)
Now, simplify the profit function:
P(q) = 625q - q^2 - 50 - 6q = -q^2 + 619q - 50
To find the quantity which maximizes the profit, you can take the first derivative of the profit function with respect to q, set it equal to 0, and solve for q:
P'(q) = -2q + 619
Set P'(q) to 0 and solve for q:
0 = -2q + 619
2q = 619
q = 309.5
Since you can't have a fraction of an item, consider checking q = 309 and q = 310 to find the maximum profit. Evaluate P(q) at both points:
P(309) = -309^2 + 619(309) - 50
P(310) = -310^2 + 619(310) - 50
P(309) = 95441
P(310) = 95439
Thus, the quantity which maximizes the profit is 309 items.
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What is the mean of the data set fifth grade jump distance
The mean of the fifth-grade jump distance data set.
How to calculate the mean of fifth-grade jump distances?To determine the mean of the data set for fifth-grade jump distances, we need the actual data values. Without the specific data set, it is not possible to calculate the mean.
The mean is the sum of all the values in a data set divided by the number of values. Therefore, we would need the individual jump distances for each fifth-grade student to calculate the mean accurately.
Once we have the complete data set, we can add up all the distances and divide by the total number of students to find the mean. Without the specific data, we cannot provide a numerical answer for the mean of the fifth-grade jump distance.
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Miles driven to see a space shuttle launch 19 27 14 28 30 51 28
For the given data set of miles driven to see a space shuttle launch, the mean is 28.14, the median is 28, and the mode is 28.
To analyze this data, let's find the mean (average), median, and mode.
1. Mean (average): Add all the miles together and divide by the total number of data points.
(19 + 27 + 14 + 28 + 30 + 51 + 28) / 7 = 197 / 7 = 28.14
The mean miles driven to see a space shuttle launch is 28.14.
2. Median: Arrange the data points in ascending order and find the middle value.
14, 19, 27, 28, 28, 30, 51
Since there are 7 data points, the median is the 4th value, which is 28.
The median miles driven to see a space shuttle launch is 28.
3. Mode: Identify the most frequently occurring value in the data set.
14, 19, 27, 28, 28, 30, 51
The number 28 appears twice, which is more than any other value.
The mode for miles driven to see a space shuttle launch is 28.
In summary, for the given data set of miles driven to see a space shuttle launch, the mean is 28.14, the median is 28, and the mode is 28.
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An initial amount of $600 is invested in a compound savings account with an annual interest rate of 3. 5%.
1. Define variables
2. Substitute into formula
3. Evaluate
Formula=A = P(1+r)t
What is the total amount after 2 years?
What is the total amount after 4 years?
After 2 years, the total amount is approximately $642.45. After 4 years, the total amount is approximately $690.27.
1. Define variables:
A = total amount after a certain number of years
P = initial amount ($600)
r = annual interest rate (3.5% or 0.035)
t = number of years
2. Substitute into formula:
A = 600(1+0.035)^t
3. Evaluate:
For 2 years (t=2):
A = 600(1+0.035)^2
A = 600(1.035)^2
A ≈ 642.45
The total amount after 2 years is approximately $642.45.
For 4 years (t=4):
A = 600(1+0.035)^4
A = 600(1.035)^4
A ≈ 690.27
The total amount after 4 years is approximately $690.27.
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ratios of sin y and cos x share?
Answer:
sin (y) = oppoaite / hypotenus
sin (y) = oppoaite / hypotenus sin (y) = opp/hyp
And for geting cos
cos(x) = adjecent / hypotenus
cos(x) = adjecent / hypotenus cos(x) = adj/hyp
Proctor & Gamble claims that at least half the bars of Ivory soap they produce are 99. 44% pure (or more pure) as advertised. Unilever, one of Proctor & Gamble's competitors, wishes to put this claim to the test. They sample the purity of 146 bars of Ivory soap. They find that 70 of them meet the 99. 44% purity advertised.
What type of test should be run?
t-test of a mean
z-test of a proportion
The alternative hypothesis indicates a
right-tailed test
two-tailed test
left-tailed test
Calculate the p-value.
Does Unilever have sufficient evidence to reject Proctor & Gamble's claim?
No
Yes
Unilever should run a z-test of a proportion to test Proctor & Gamble's claim that at least half of the bars of Ivory soap they produce are 99.44% pure or more.
What is the appropriate test that Unilever should conduct to test Proctor & Gamble's claim about Ivory soap's purity?Unilever should use a z-test of a proportion to test whether Proctor & Gamble's claim that at least 50% of Ivory soap bars are 99.44% pure or more is statistically significant based on a sample of 146 bars, of which 70 meet the purity criteria.
The null hypothesis is that the proportion of Ivory soap bars meeting the purity criteria is 0.50, and the alternative hypothesis is that it is greater than 0.50. The z-test yields a p-value of 0.038, which is less than the significance level of 0.05.
Thus, Unilever has sufficient evidence to reject Proctor & Gamble's claim and conclude that the proportion of Ivory soap bars meeting the purity criteria is significantly different from 50%.
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You babysat your neighbor's children, and they paid you $45 for 6 hours.
What is the rate?
What is the unit rate?
Write a function rule to represent this situation.
Answer:
The rate is $7.50 per hour.
The unit rate is $7.50 per hour.
This function rule represents the relationship between the number of hours worked (x) and the amount earned (y) at a rate of $7.50 per hour.
Step-by-step explanation:
To find the rate, divide the total amount earned by the number of hours worked. In this case, you earned $45 for 6 hours.
Rate = Total amount earned / Number of hours worked
Rate = $45 / 6 hours
Rate = $7.50 per hour
The rate is $7.50 per hour.
The unit rate refers to the rate per unit of one. In this case, it would be the rate per hour.
Unit Rate = Rate / Number of units
Unit Rate = $7.50 / 1 hour
Unit Rate = $7.50 per hour
The unit rate is $7.50 per hour.
To write a function rule to represent this situation, let's use "x" to represent the number of hours worked and "y" to represent the amount earned:
y = Rate * x
Since the rate is $7.50 per hour, the function rule can be written as:
y = 7.50x
This function rule represents the relationship between the number of hours worked (x) and the amount earned (y) at a rate of $7.50 per hour.
Answer:
Step-by-step explanation:
7.5
Can someone please help I'm stuck at this
Answer:
Step-by-step explanation:
6.48x1.0e5=x
x/0.35
Determine Whether The Series Is Convergent Or Divergent. Σ ^n√14
Based on the Root Test, the series Σ^n√14 is convergent.
Hi! To determine if the series Σ^n√14 is convergent or divergent, we need to analyze the terms involved. The series can be written as:
Σ (n√14)
This is a sum of terms, where each term is the n-th root of 14, and we want to find out if the sum converges or diverges as n goes to infinity.
In this case, the series is a type of p-series, where the terms follow the general form of 1/n^p. To be a convergent p-series, p must be greater than 1. Here, the terms are in the form of 14^(1/n), which can be rewritten as (14^(1))^(-n) or 14^(-n). This is not a p-series, as the exponent is not in the form of 1/n^p.
To further analyze the series, we can use the Divergence Test. If the limit of the terms as n goes to infinity is not equal to zero, then the series is divergent. So, let's find the limit:
lim (n → ∞) (14^(-n))
As n approaches infinity, the exponent -n becomes increasingly negative, and 14^(-n) approaches 0. However, the Divergence Test is inconclusive in this case, as it only confirms divergence if the limit is not equal to zero.
To determine convergence or divergence, we can use the Root Test. The Root Test states that if the limit of the n-th root of the absolute value of the terms as n goes to infinity is less than 1, then the series converges. Let's find the limit:
lim (n → ∞) |(14^(-n))|^(1/n)
This simplifies to:
lim (n → ∞) 14^(-1)
Since 14^(-1) is a constant value less than 1, the limit is less than 1.
Thus, based on the Root Test, the series Σ^n√14 is convergent.
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There are 7 purple flowers, 9 yellow flowers, and 12 pink flowers in a bouquet. You choose a flower to give to a
friend, then choose another flower for yourself. Is this an independent or dependent event? Explain how you
know.
Choosing two flowers from a bouquet with 7 purple, 9 yellow, and 12 pink flowers is a dependent event.
This is a dependent event. The reason is that after choosing a flower to give to a friend, the number of flowers left in the bouquet changes, which in turn affects the probability of choosing a specific color for yourself. Since the outcome of the first choice impacts the probability of the second choice, the events are dependent.
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help me What is the rule of this function?– 5+ 5× 5÷ 5
÷ 5
Question 1 of 7
The value of the expression 5 + 5 × 5 ÷ 5 ÷ 5 is equal to 10.
What is the rule of the function?The order of operations in mathematics is to perform the operations in the following order:
Parentheses or BracketsExponents or RootsMultiplication or Division (from left to right)Addition or Subtraction (from left to right)Using this rule, we can simplify the expression:
First, we perform the multiplication and division from left to right:
5 x 5 = 25
25 ÷ 5 = 5
Then, we add the remaining terms:
5 + 5 = 10
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A string has a length of 80 cm. It is cut into pieces in the ratio 1: 4: 5. Calculate the length of the longest piece.
First, we need to find the total number of parts in the ratio 1:4:5:
1 + 4 + 5 = 10
This means that the string is divided into 10 equal parts. To find the length of each part, we divide the total length of the string by the number of parts:
80 cm ÷ 10 = 8 cm
Now, we can find the length of the longest piece, which is 5 times the size of each part:
8 cm x 5 = 40 cm
Therefore, the length of the longest piece is 40 cm.
X is a discrete random variable. The table below defines a probability distribution for X.
What is the expected value of X?
The expected value of x is given as follows:
E(X) = 1.6.
What is the mean of a discrete distribution?The expected value of a discrete distribution is given by the sum of each outcome multiplied by it's respective probability.
The distribution for this problem is given as follows:
P(X = -7) = 0.2.P(X = -3) = 0.1.P(X = 3) = 0.4.P(X = 7) = 0.3.Hence the expected value is given as follows:
E(X) = -7 x 0.2 - 3 x 0.1 + 3 x 0.4 + 7 x 0.3
E(X) = 1.6.
Missing InformationThe table is given by the image presented at the end of the answer.
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How many 5 liter gas tanks can you fill from a full 20 liter gas can
You can fill 4 five liter gas tanks from a full 20 liter gas can.
To determine how many 5-liter gas tanks can be filled from a full 20-liter gas can, you would divide the total capacity of the gas can by the capacity of the individual gas tanks.
Step 1: Identify the total capacity of the gas can (20 liters) and the capacity of each gas tank (5 liters).
Step 2: Divide the total capacity by the individual tank capacity (20 liters / 5 liters).
Your answer: You can fill 4 (20 liters / 5 liters = 4) 5-liter gas tanks from a full 20-liter gas can.
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2 Find the first derivative x^{2/3} + y^{2/3} =14
The first derivative of the implicit function given by x^(2/3) + y^(2/3) = 14 can be found using implicit differentiation. We take the derivative of both sides with respect to x and use the chain rule to differentiate the terms involving y:(2/3)x^(-1/3) + (2/3)y^(-1/3) * dy/dx = 0Then, we solve for dy/dx:dy/dx = -(x/y)^(1/3)This is the first derivative of the implicit function. To evaluate it at a specific point, we need to substitute the coordinates of that point into the equation above.
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[tex]dy/dx = -x^{-1/3} / y^{-1/3}[/tex]
To find the first derivative of the given equation x^{2/3} + y^{2/3} = 14, we will differentiate both sides of the equation with respect to x and then solve for dy/dx (the first derivative of y with respect to x).
Step 1: Differentiate both sides of the equation with respect to x.
[tex]d/dx (x^{2/3} + y^{2/3}) = d/dx (14)[/tex]
Step 2: Apply the chain rule to differentiate y^{2/3}.
[tex]d/dx (x^{2/3}) + d/dx (y^{2/3}) = 0(2/3)x^{-1/3} + (2/3)y^{-1/3}(dy/dx) = 0[/tex]
Step 3: Solve for dy/dx.
[tex](2/3)y^{-1/3}(dy/dx) = -(2/3)x^{-1/3}dy/dx = -(2/3)x^{-1/3} / (2/3)y^{-1/3}[/tex]
Step 4: Simplify the expression.
[tex]dy/dx = -x^{-1/3} / y^{-1/3}[/tex]
Your answer: [tex]dy/dx = -x^{-1/3} / y^{-1/3}[/tex]
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The local regional transit authority of a large city was interested in determining the mean commuting time for workers who drove to work. They selected a random sample of 125 residents of the metropolitan region and asked them how long they spent commuting to work (in minutes). A 95% confidence interval was constructed and reported as (27. 74, 30. 06). Interpret the interval in the context of this problem. 2. A long distance telephone company recently conducted research into the length of calls (in minutes) made by customers. In a random sample of 45 calls, the sample mean was minutes and the standard deviation was s 5. 2 minutes. (a) Find a 95% confidence interval for the true mean length of long distance telephone calls made by customers of this company. X 1. 68
For the first problem, we can interpret the confidence interval as follows:
We are 95% confident that the true mean commuting time for workers who drive to work is between 27.74 and 30.06 minutes.
This means that if we were to repeat the sampling process many times and construct a 95% confidence interval each time, about 95% of those intervals would contain the true mean commuting time.
For the second problem, we can use the following formula to find a 95% confidence interval for the true mean length of long distance telephone calls:
[tex]CI = X ± t*(s/sqrt(n))[/tex]
Where X is the sample mean, s is the sample standard deviation, n is the sample size, and t is the t-value from the t-distribution with n-1 degrees of freedom for a 95% confidence interval.
Plugging in the values given, we get:
[tex]CI = 1.68 ± t*(5.2/sqrt(45))[/tex]
To find the value of t, we can look it up in a t-distribution table or use a calculator. For a 95% confidence interval with 44 degrees of freedom, we get t = 2.015.
Plugging this value in, we get:
[tex]CI = 1.68 ± 2.015*(5.2/sqrt(45)) = (0.86, 2.50)[/tex]
So we can interpret the interval as follows:
We are 95% confident that the true mean length of long distance telephone calls made by customers of this company is between 0.86 and 2.50 minutes longer or shorter than the sample mean of 1.68 minutes.
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Due to an unresolved national issue, the popularity of a politician is suspected to have decreased over the past year. his popularity vote percentage used to be 55%. to confirm the suspicion, a sample of 820 adult residents is surveyed. the survey reveals that 405 of the respondents still support him. determine if there exists a significant decrease in his popularity vote percentage. use significance level of 0.10 to conduct a hypothesis testing
Answer:
Step-by-step explanation:
To test if there exists a significant decrease in the popularity vote percentage of the politician, we can conduct a hypothesis test using the significance level of 0.10.
The null hypothesis, denoted by H0, is that there is no significant decrease in the politician's popularity vote percentage. The alternative hypothesis, denoted by H1, is that there is a significant decrease in the politician's popularity vote percentage.
We can use the sample proportion of supporters, which is 405/820 = 0.494, as an estimator of the true proportion of supporters in the population.
Assuming the null hypothesis is true, we can calculate the standard error of the sample proportion using the formula sqrt(p(1-p)/n), where p is the hypothesized proportion (0.55) and n is the sample size (820). This gives us a standard error of sqrt(0.55*0.45/820) = 0.024.
We can then calculate the test statistic using the formula (p - hypothesized proportion)/standard error, where p is the sample proportion. This gives us a test statistic of (0.494 - 0.55)/0.024 = -2.333.
With a significance level of 0.10 and a two-tailed test, the critical values for the test statistic are -1.645 and 1.645. Since the calculated test statistic (-2.333) is outside the range of the critical values, we can reject the null hypothesis.
Therefore, we can conclude that there is sufficient evidence to suggest a significant decrease in the popularity vote percentage of the politician at a significance level of 0.10.
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Evan bought 7 books on sale for 45.50 the regular price of the 7 books 57.75 how much did evan save per books buying them on salw
Evan saved $1.75 per book by buying them on sale.
Evan bought 7 books on sale for $45.50, with a regular price of $57.75. What was the per-book savings?To find out how much Evan saved per book by buying them on sale, you can use the following formula:
Savings per book = (Regular price per book - Sale price per book)
First, you need to find the regular price per book:
Regular price per book = (Total regular price of 7 books) / 7
Regular price per book = 57.75 / 7
Regular price per book = 8.25
Next, you need to find the sale price per book:
Sale price per book = (Total sale price of 7 books) / 7
Sale price per book = 45.50 / 7
Sale price per book = 6.50
Now, you can find the savings per book:
Savings per book = (Regular price per book - Sale price per book)
Savings per book = (8.25 - 6.50)
Savings per book = 1.75
Therefore, Evan saved $1.75 per book by buying them on sale.
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A construction worker needs to determine the volume of a sand pile in a construction yard, and shown. A like along the surface of the sand pile from the ground to the top of the sand pile makes a 40 degree angle with the ground at point R. The length of the slant slide of the sand pile, RT, from the ground to the top of the sand pile is 20 meters. What is the volume of the sand pile to the nearest cubic meter?
The volume of the sand pile to the nearest cubic meter would be 10,121 cubic meters.
How to find the volume ?To find the volume of the sand pile, we need to know its base dimensions and height. Since we have the angle and the length of the slant side (RT) of the pile, we can use trigonometry to find the height and base dimensions.
We can use the sine function to find the height (TO):
sin(R) = opposite / hypotenuse
sin(40) = TO / 20
We can also use the cosine function to find the radius (RO):
cos(R) = adjacent / hypotenuse
cos(40) = RO / 20
Calculate the values:
TO = 20 x sin(40) = 12.85 meters
RO = 20 x cos(40) = 15.32 meters
Finally, we can find the volume V of the cone-shaped sand pile using the formula:
V = (1/3) x π x r² x h
V = (1/3) x π x (15.32)² x 12.85
V = 10,121.39 cubic meters
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