The position of the mass of the object 2kg at time t =1s is equal to -3.97m approximately .
Mass of the object 'm' = 2 kg
Damping constant 'c' = 10
Spring constant 'k' = F/x
= 4 N / 0.5 m
= 8 N/m
F(t) is any external force applied to the object
x is the displacement of the object from its equilibrium position
x(0) = 1 m (initial displacement)
x'(0) = 0 (initial velocity)
Equation of motion for a spring-mass system with damping is,
mx'' + cx' + kx = F(t)
Substituting these values into the equation of motion,
Since there is no external force applied
2x'' + 10x' + 8x = 0
This is a second-order homogeneous differential equation with constant coefficients.
The characteristic equation is,
2r^2 + 10r + 8 = 0
Solving for r, we get,
⇒ r = (-10 ± √(10^2 - 4× 2× 8)) / (2×2)
=( -10 ± 6 )/ 4
= ( -2.5 ± 1.5 )
The general solution for x(t) is,
x(t) = e^(-5t) (c₁ cos(t) + c₂ sin(t))
Using the initial conditions x(0) = 1 and x'(0) = 0, we can solve for the constants c₁ and c₂
x(0) = c₁
= 1
x'(t) = -5e^(-5t) (c₁ cos(t) + c₂ sin(t)) + e^(-5t) (-c₁ sin(t) + c₂ cos(t))
x'(0) = -5c₁ + c₂ = 0
⇒-5c₁ + c₂ = 0
⇒ c₂ = 5c₁ = 5
The solution for x(t) is,
x(t) = e^(-5t) (cos(t) + 5 sin(t))
The position of the mass at any time t is given by x(t),
Plug in any value of t to find the position.
For example, at t = 1 s,
x(1) = e^(-5) (cos(1) + 5 sin(1))
≈ -3.97 m
The position of the mass oscillates sinusoidally and decays exponentially due to the damping.
Therefore, the position of the mass at t = 1 s is approximately -3.97 m.
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if loga 3=p and log 5=q then loga 45 is equivalent to which of the following:
QP^2, Q+2P, 5Q+3P, 3(Q+P), or 3(Q+2P)
the answer to log 45 will be Q + 2P.
What is Logarithmic functions?
A logarithmic function is a type of function that can be expressed in the form: f(x) = a log(bx + c) + d where a, b, c, and d are constants and x is the independent variable. The base of the logarithm is usually assumed to be 10, but can be any other positive number.
Logarithmic functions are used in a variety of applications, including finance, physics, and engineering. In finance, logarithmic functions are used to calculate compound interest. In physics, logarithmic functions are used to describe exponential decay and growth. In engineering, logarithmic functions are used to model the behavior of electrical circuits and other systems.
log a (45) = log a (9) + log a (5)
Next, we can use the fact that log a (x^n) = n log a (x) to simplify the first term:
log a (9) = log a (3²) = 2 log a (3) = 2p
Finally, we can substitute the given values for p and q and simplify the expression:
log a (45) = 2p + q = 2 log a (3) + log a (5) = log a (3²) + log a (5) = log a (3² * 5)
Therefore, we have:
log a (45) = log a (3² * 5)
Now, using the property that log a (x * y) = log a (x) + log a (y), we can simplify this expression even further:
log a (45) = log a (3²) + log a (5) = 2 log a (3) + log a (5) = Q + 2P
Therefore, log a (45) is equivalent to Q + 2P.
Therefore, the answer is Q + 2P.
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The number of girls to boys in the education program is 5 to 1. If there are 90 students in the education program, how many are girls?
Randy is planning to drive from New Jersey to Florida. Every time Randy stops
for gas, he records the distance he traveled in miles and the total number of gallons
Lised. Assume that the number of miles driven is proportional to the number of
Dallons consumed in order to complete the table.
The missing values of the table representing the number of miles driven is proportional to the number of gallons consumed are,
Gallons consumed : 2 4 7 8 10 12
Miles driven : 54 108 189 216 270 324
Let us consider 'x' represents the number of miles driven .
And 'y' represents the number of gallons consumed .
Number of miles driven is proportional to the number of gallons consumed.
⇒ ( x₁ / x₂ ) = ( y₁ / y₂ )
⇒ ( 2/ 4) = ( 54 / y₂ )
⇒y₂ = ( 54 × 4 ) / 2
⇒y₂ = 108.
⇒ ( x₁ / x₃ ) = ( y₁ / y₃ )
⇒ ( 2/ x₃) = ( 54 / 189)
⇒x₃ = ( 189 × 2 ) / 54
⇒x₃= 7
⇒ ( x₁ / x₅ ) = ( y₁ / y₅ )
⇒ ( 2/ 10) = ( 54 / y₅ )
⇒y₅ = ( 54 × 10 ) / 2
⇒y₅ = 270.
⇒ ( x₁ / x₆ ) = ( y₁ / y₆ )
⇒ ( 2/ 12) = ( 54 / y₆ )
⇒y₆ = ( 54 × 12 ) / 2
⇒y₆ = 324
Therefore, using the proportional relation between miles driven and gallons consumed the value of the table are,
Gallons consumed : 2 4 7 8 10 12
Miles driven : 54 108 189 216 270 324
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The above question is incomplete, the complete question is:
Randy is planning to drive from New Jersey to Florida. Every time Randy stops for gas, he records the distance he traveled in miles and the total number of gallons used. Assume that the number of miles driven is proportional to the number of gallons consumed in order to complete the table.
Gallons consumed : 2 4 8 10 12
Miles driven : 54 189 216
The length of a rectangle is 4/3 its width and it's area is 8 1/3 square meters. What are it's dimensions?. Write your answers as mixed numbers
The dimensions of the given rectangle is 2 1/2 meters (width) and 3 1/3 meters (length).
First, let's define the variables for the rectangle: let the width be w meters, and the length be (4/3)w meters since the length is 4/3 times the width. The area of a rectangle is calculated by multiplying its length and width. In this case, the given area is 8 1/3 square meters.
Now, we can write an equation using the area and dimensions:
Area = Length × Width
8 1/3 = (4/3)w × w
First, convert the mixed number 8 1/3 to an improper fraction, which is 25/3. Then, we can solve for w:
25/3 = (4/3)w²
To find w², multiply both sides by 3/4:
w² = (25/3) × (3/4)
w² = 25/4
Now, take the square root of both sides:
w = √(25/4)
w = 5/2
So, the width is 5/2 meters, or 2 1/2 meters. To find the length, multiply the width by 4/3:
Length = (4/3)(5/2) = 20/6 = 10/3
The length is 10/3 meters, or 3 1/3 meters. Therefore, the dimensions of the rectangle are 2 1/2 meters (width) and 3 1/3 meters (length).
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9. castle black camping is twice as risky as the average stock. the market should earn 11% and the risk free rate is 2%. what is a fair return for cbc? (20%)
10. harlan county safety co. has a beta of 1.2. form a portfolio that is half hcsc and half cbc (from number 9). what is a fair return? (16.4%)
The fair return for Castle Black Camping (CBC) is 20%.
This is calculated by subtracting the risk-free rate (2%) from the market's expected return (11%), and then multiplying the result by 2 (since CBC is twice as risky as the average stock).
To form a portfolio that is half Harlan County Safety Co. (HCSC) and half CBC, we need to calculate the portfolio's beta. This is done by multiplying each stock's beta by its weight in the portfolio, and then adding the results. In this case, the portfolio's beta would be 0.6 (1.2 x 0.5 + 2 x 0.5).
The fair return for the portfolio is then calculated by adding the risk-free rate to the product of the portfolio's beta and the market's expected return. This gives us a fair return of 16.4% for the HCSC and CBC portfolio.
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On the interval [−4,4] we know that x and x2 are orthogonal. Let p=x+ax2+bx3. Then
⟨p,x⟩=
⟨p,x2⟩=
So if we want p to be orthogonal to both x and x2 we have to solve the system of equations
=0
=0
Which gives us
p=
The value of p is x-5/48x³ On the interval [−4,4] we know that x and x² are orthogonal.
The p-value, under the assumption that the null hypothesis is true, is the likelihood of receiving findings from a statistical hypothesis test that are at least as severe as the observed results. The p-value provides the minimal level of significance at which the null hypothesis would be rejected as an alternative to rejection points. The alternative hypothesis is more likely to be supported by greater evidence when the p-value is lower.
P-value is frequently employed by government organisations to increase the credibility of their research or findings. The U.S. Census Bureau, for instance, mandates that any analysis with a p-value higher than 0.10 be accompanied by a statement stating that the difference is not statistically significant from zero. The Census Bureau has also established guidelines that specify which p-values are acceptable.
<p, x> = [tex]\int\limits^2_{-2} {x(x+ax^2+bx^3)} \, dx[/tex]
[tex]= \int\limits^2_{-2} {x^2} \, dx +a\int\limits^2_{-2} {x^3} \, dx +b\int\limits^2_{-2} {x^4} \, dx[/tex]
Right so the middle integral is zero already since you said x and x² are orthogonal,
= 2([tex]\int\limits^2_0 {x^2} \, dx +b\int\limits^2_0 {x^4} \, dx[/tex])
[tex]=2(\frac{x^3}{3} +\frac{bx^5}{5} )^2_0[/tex]
b = -5/12.
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An egg is dropped from the roof of a building. The distance it falls varies directly with the square of the time it falls. It takes 1/2 second for the egg to fall eight feet, how long will it take the egg to fall 200 feet?
What does K equal? And how many seconds?
Answer:
16 seconds
Step-by-step explanation:
The area of a circular pizza is 2122.64 square centimeters. What is the diameter of the pizza?
Area of a circle = pi x r^2
---For the purposes of this problem, pi = 3.14
2122.64 = (3.14)(r^2)
676 = r^2
r = 26 cm
Diameter = 2 x radius
diameter = 2 x 26
diameter = 54 cm
Answer: diameter = 54 cm
Hope this helps!
Based on the following calculator output, determine the mean of the dataset, rounding to the nearest 100th if necessary.
1-Var-Stats
1-Var-Stats
x
Ë
=
265. 857142857
x
Ë
=265. 857142857
Σ
x
=
1861
Σx=1861
Σ
x
2
=
510909
Σx
2
=510909
S
x
=
51. 8794389954
Sx=51. 8794389954
Ï
x
=
48. 0310273869
Ïx=48. 0310273869
n
=
7
n=7
minX
=
209
minX=209
Q
1
=
221
Q
1
â
=221
Med
=
252
Med=252
Q
3
=
311
Q
3
â
=311
maxX
=
337
maxX=337
The mean of the dataset, rounded to the nearest hundredth, is approximately 265.86.
Calculate the mean of the dataset from calculator?
The mean, also known as the average, is a measure of central tendency that represents the typical value of a dataset. It is calculated by summing up all the values in the dataset and dividing the sum by the number of values.
To calculate the mean of the dataset from the calculator output, we need to use the following formula:
mean = Σx / n
where Σx is the sum of all the values in the dataset, and n is the number of values in the dataset.
From the calculator output, we can see that:
Σx = 1861
n = 7
Substituting these values into the formula, we get:
mean = 1861 / 7
mean = 265.857142857
However, the problem asks us to round the mean to the nearest hundredth, so we need to round the answer to two output decimal places. To do this, we look at the third decimal place of the answer, which is 7, and we check the next decimal place, which is 1. Since 1 is less than 5, we leave the third decimal place as it is and drop all the decimal places after it. Therefore, the rounded mean is:
mean ≈ 265.86
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Use Newton's method to obtain the third approximation, X2, of the positive fourth root of 3 by calculating the third approximation of the right 0 of f(x)=x*- 3. Start with Xo = 1. The third approximation of the fourth root of 3 determined by calculating the third approximation of the right 0 of f(x) = x4 - 3, starting with Xo = 1, is (Round to four decimal places.) -
To use Newton's method to find the third approximation, X2, of the positive fourth root of 3, we follow these steps:
1. Define the function f(x) and its derivative, f'(x): f(x) = x^4 - 3 f'(x) = 4x^3
2. Start with an initial guess, X0 = 1.
3. Apply Newton's method formula to find the next approximations:
Xn+1 = Xn - f(Xn) / f'(Xn)
4. Calculate the first approximation, X1: X1 = X0 - f(X0) / f'(X0) X1 = 1 - (1^4 - 3) / (4 * 1^3) X1 = 1 - (-2) / 4 X1 = 1 + 0.5 X1 = 1.5
5. Calculate the second approximation, X2: X2 = X1 - f(X1) / f'(X1) X2 = 1.5 - (1.5^4 - 3) / (4 * 1.5^3) X2 = 1.5 - (5.0625 - 3) / 13.5 X2 = 1.5 - 2.0625 / 13.5 X2 = 1.5 - 0.15296 X2 ≈ 1.3470
So, the third approximation of the positive fourth root of 3, determined by calculating the third approximation of the right 0 of f(x) = x^4 - 3, starting with X0 = 1, is approximately 1.3470 (rounded to four decimal places).
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Use the appropriate compound interest formula to find the amount that will be in each account, given the stated conditions.
$24.000 invested at 4% annual interest for 7 years compounded (a) annually: (b) semiannually
Account amount after 7 years will be approximately:
(a) $31,950.42 when compounded annually
(b) $32,166.25 when compounded semiannually
We'll be using the compound interest formula to find the amount in each account for both (a) annual compounding and (b) semiannual compounding.
The compound interest formula is: A = P(1 + r/ⁿ)ⁿᵃ
Where:
A = the future amount in the account
P = the principal (initial investment)
r = Annual interest rate
n = Interest is compounded per year in numbers
a = the number of years
(a) Annual Compounding:
In this case n = 1.
P = $24,000
r = 4% = 0.04
n = 1
t = 7
A = 24000(1 + 0.04/1)¹ˣ⁷
A = 24000(1 + 0.04)⁷
A = 24000(1.04)⁷
A ≈ $31,950.42
(b) Semiannual Compounding:
For semiannual compounding, the interest is compounded twice a year, so n = 2.
P = $24,000
r = 4% = 0.04
n = 2
t = 7
A = 24000(1 + 0.04/2)²ˣ⁷
A = 24000(1 + 0.02)¹⁴
A ≈ $32,166.25
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What connection does the author draw between the workers’ rights and their quality of life? in the st. Petersburg workmen's petition to the tsar
The "St. Petersburg Workmen's Petition to the Tsar" was a document written in 1870 by a group of Russian workers, which expressed their grievances and called for greater rights and protections in the workplace.
While the text of the petition is too long to summarize in its entirety, the following points illustrate some of the connections that the authors draw between workers' rights and their quality of life:
- The petitioners argue that workers have the right to a fair wage that allows them to support themselves and their families, and that without this right, workers are forced to live in poverty and squalor.
- They also argue that workers have the right to safe and healthy working conditions, and that without this right, workers are subjected to disease and injury that can shorten their lives and reduce their quality of life.
- The petitioners further argue that workers have the right to organize and advocate for their own interests, that without this right, workers are powerless to negotiate with their employers and to protect themselves against exploitation.
- They also argue that workers have the right to education and self-improvement, and that without this right, workers are trapped in a cycle of ignorance and subservience that limits their potential and reduces their quality of life.
- Overall, the authors of the petition argue that workers' rights and their quality of life are inextricably linked, and that without the former, the latter is impossible to achieve.
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PLEASE HELP WILL MARK BRANLIEST
If the first, last, middle car in the parking-row are blue, then the total number of different arrangements are 144.
There are 7 different models of cars, out of which 3 are blue and 4 are red.
If the first, middle and last car in the row is blue, which means that the the position of blue cars is fixed and these 3 "blue-cars" can be arranged in 3! ways.
Now, only the 4 spots are left, so, the remaining 4 red-cars can be arranged in the remaining 4 spots in = 4! ways.
Therefore, the total number of ways is = 3! × 4! = 6 × 24 = 144.
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Your doing practice 4
Using the compound interest formula, the amount in Russ' account after 4 years is $ 12588.15
How to find the how much will be in Russ' account after 4 years?To find how much will be in Russ' account after 4 years, we use the compound interest formula.
A = P(1 + r)ⁿ where
A = amount after n years,P = principal,r = interest rate andn = number of yearsGiven that
P = $8000r = 6 % compounded semi annually = 6% ÷ 1/2 per year = 12 % per year = 0.12n = 4 yearsSo, substituting the values of the variables into the equation, we have that
A = P(1 + r)ⁿ
A = $8000(1 + 0.12)⁴
A = $8000(1.12)⁴
A= $8000(1.5735)
A= $ 12588.15
So, the amount is $ 12588.15
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A rental car company charges $22. 15 per day to rent a car and $0. 07 for every mile driven. Aubrey wants to rent a car, knowing that:
She plans to drive 275 miles.
She has at most $130 to spend.
Write and solve an inequality which can be used to determine dd, the number of days Aubrey can afford to rent while staying within her budget
An inequality to represent this situation is 22.15d + 0.07(275) ≤ 130. Aubrey can afford to rent the car for up to 5 days while staying within her budget.
Let's denote the number of days Aubrey can rent the car as "d". We know that the rental car company charges $22.15 per day and $0.07 per mile. Aubrey has a budget of $130 and plans to drive 275 miles. We can create an inequality to represent this situation:
22.15d + 0.07(275) ≤ 130
Now, let's solve the inequality:
22.15d + 19.25 ≤ 130
Subtract 19.25 from both sides:
22.15d ≤ 110.75
Now, divide by 22.15 to find the maximum number of days Aubrey can rent the car:
d ≤ 110.75 / 22.15
d ≤ 5
So, Aubrey can afford to rent the car for up to 5 days while staying within her budget.
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If the solutions to 4x² + 1 = 81 are tg√/5, what is the value of g?
9 =
PLEASE HELP
Answer: 2√5, -2√5
Step-by-step explanation:
Find the value of c step by step
PLEASE HELP
Answer:
c = 12
Step-by-step explanation:
[tex] {5}^{2} + {c}^{2} = {13}^{2} [/tex]
[tex]25 + {c}^{2} = 169[/tex]
[tex] {c}^{2} = 144[/tex]
[tex]c = 12[/tex]
write your own word problem that can be solved using equivalent ratios.
solve your problem
Word problem: The ratio of the number of people that attended Michael party to the number of people that attended Joshua's party is 5: 25
How to determine the expressionFirst, we need to know that equivalent ratios are those ratios that can usually be simplified to a similar value.
Also, algebraic expressions are defined as expressions that are composed of terms, variables, coefficients, terms, constants and factors.
These expressions are also made up of arithmetic operations such as addition, multiplication, subtraction, bracket, parentheses, etc
From the information given,
The word problem is;
The ratio of the number of people that attended Michael party to the number of people that attended Joshua's party is 5: 25
This is represented as;
5/25
Divide the values
1/5
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please answer thanksss
Answer:
this says that why is bigger than one but why is smaller than four. meaning the coordinate why could only be between one and four. and it says that x is smaller than y
so the only coordinates with whole numbers that would satisfy the inequalities would be (3,2) (2,1)
Ronald buys fresh fruit from a fruit stand. Apples cost $5 per pound and peaches cost $6 per pound. He has $60 to spend. The table shows the function relating the number of pounds of apples, x, and the number of pounds of peaches, y, Ronald could purchase.
PLEASE ANSWER REALLY FAST
Answer:
Step-by-step explanation:
Unfortunately, there is no table provided in your question. However, we can still solve the problem based on the given information.
Let's assume that Ronald buys "x" pounds of apples and "y" pounds of peaches. We know that the cost of apples is $5 per pound, and the cost of peaches is $6 per pound.
So, the total cost of apples will be 5x, and the total cost of peaches will be 6y. We also know that Ronald has $60 to spend. Therefore, we can write the following equation:
5x + 6y = 60
This is the equation that represents the total cost of apples and peaches that Ronald can buy with $60.
However, we want to find the function that relates the number of pounds of apples, x, and the number of pounds of peaches, y, that Ronald can purchase. To do this, we need to solve the above equation for y in terms of x:
5x + 6y = 60
6y = 60 - 5x
y = (60 - 5x)/6
This is the function that relates the number of pounds of apples, x, and the number of pounds of peaches, y, that Ronald can purchase with $60.
Help with the problem in photo please!
The angle ZFD = 57°
How did we get the value?Given that:
arc FZ = 66"
FD is the diameter ·Because passing through, Centre.
Angle formed arc FZ at centre = 66°
Angle formed the arc FZ at Circumference at Circle ¹/₂ x66 = 33°
FD is diameter
∠Z= 90°.
∠ZFD = ∠ in Δ FZD
∠ZFD + ∠FZD + ∠FDZ = 180°
∠ZFD + 90° + 33° = 180°
∠ZFD = 180° - 90° - 33° = 57°
Hence the ∠ZFD = 57°
Therefore, angle ZFD is 57°
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The probability that Trevor studies for at least 50 minutes and passes his Algebra test is 0.88. The probability that he studies for at least 50 minutes is 0.92.
Step-by-step explanation:
If we let A be the event that Trevor studies for at least 50 minutes, and let B be the event that he passes his Algebra test, then we know:
P(A and B) = 0.88
P(A) = 0.92
We want to find the probability that Trevor passes his Algebra test given that he studied for at least 50 minutes, or in other words, we want to find P(B|A).
We can use Bayes' theorem to find this probability:
P(B|A) = P(A and B) / P(A)
Substituting in our values, we get:
P(B|A) = 0.88 / 0.92
Simplifying this fraction, we get:
P(B|A) = 0.9565
Therefore, the probability that Trevor passes his Algebra test given that he studied for at least 50 minutes is approximately 0.9565.
PLEASE HELP ASAP WILL GIVE BRAINLIEST
Lizzie came up with a divisibility test for a certain number m≠1: Break a positive integer n into two-digit chunks, starting from the ones place. (For example, the number 354764 would break into the two-digit chunks 35, 47, and 64) Find the alternating sum of these two-digit numbers, by adding the first number, subtracting the second, adding the third, and so on. (In our example, this alternating sum would be ) Find m and show that this is indeed a divisibility test for m (by showing that n is divisible by m if and only if the result of this process is divisible by m )
The value of m is 11, and the divisibility test states that n is divisible by 11 if and only if the alternating sum of its two-digit chunks is divisible by 11.
How to prove the divisibility test?Let's consider the given divisibility test proposed by Lizzie. The process involves breaking a positive integer, n, into two-digit chunks and finding the alternating sum of these chunks. The alternating sum is obtained by adding the first number, subtracting the second, adding the third, and so on.
To find the value of m that makes this a divisibility test, we need to analyze the properties of this test. Let's assume that n is divisible by m.
When n is divisible by m, each two-digit chunk in n will also be divisible by m. This means that the alternating sum of these chunks will also be by m since adding or subtracting multiples of m will not change its divisibility.
Conversely, if the alternating sum of the two-digit chunks is divisible by m, it implies that each chunk is divisible by m. Therefore, if the chunks are divisible by m, the original number n will also be divisible by m.
Hence, this process indeed serves as a divisibility test for m, where n is divisible by m if and only if the result of the alternating sum of the two-digit chunks is divisible by m.
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(1 point) Consider the power series Σε - 3), (8x - 3)" n2 Find the radius of convergence R. If it is infinite, type "infinity" or "inf". Answer: R= What is the interval of convergence? Answer (in in
R = 1/8 and the interval of convergence is (-1/8, 1/8).
We can use the ratio test to determine the radius of convergence:
lim_n→∞ |(ε_n+1 - 3)(8x - 3)^n+1 / (ε_n - 3)(8x - 3)^n)|
= lim_n→∞ |(ε_n+1 - 3)/(ε_n - 3)| |8x - 3|
Since the limit of the ratios of consecutive terms is independent of x, we can evaluate it at any particular value of x, such as x = 0:
lim_n→∞ |(ε_n+1 - 3)/(ε_n - 3)| = 1/8
Therefore, the series converges absolutely for |8x - 3| < 1/8, and diverges for |8x - 3| > 1/8. We also need to check the endpoints of the interval:
When 8x - 3 = 1/8, the series becomes Σε_n, which diverges since ε_n is not a null sequence.
When 8x - 3 = -1/8, the series becomes Σ(-1)^nε_n, which converges by the alternating series test, since ε_n is decreasing and approaches zero.
Thus, the interval of convergence is (-1/8, 1/8).
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ON OO
11 At the end of October, Fiona's electricity meter reads 88738 kWh.
At the end of November, her electricity meter reads 89 198 kWh.
Each kWh of electricity Fiona uses costs 16p
Work out how much Fiona had to pay for the electricity she used in November
Answer:
£73.60
Step-by-step explanation:
89198 kWh - 88738 kWh = 460 kWh.
Since each kWh of electricity costs 16p, Fiona’s total cost for electricity in November would be 460 kWh * 16p/kWh = 7360p.
Since there are 100 pence in a pound, this is equivalent to £73.60.
So, Fiona had to pay £73.60 for the electricity she used in November.
The requreid Fiona had to pay £73.60 for the electricity she used in November.
What is arithmetic?It involves the basic operations of addition, subtraction, multiplication, and division, as well as more advanced operations such as exponents, roots, logarithms, and trigonometric functions.
To find out how much electricity Fiona used in November, we need to subtract the October reading from the November reading:
89,198 kWh - 88,738 kWh = 460 kWh
So, Fiona used 460 kWh of electricity in November.
To find out how much she had to pay, we need to multiply the number of kWh by the cost per kWh:
460 kWh × 16p/kWh = 7360p
We can convert pence to pounds by dividing by 100:
7360p ÷ 100 = £73.60
Therefore, Fiona had to pay £73.60 for the electricity she used in November.
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We want to conduct a hypothesis test of the claim that the population mean time it takes drivers to react following the application of brakes by the driver in front of them is more than 2. 5 seconds. So, we choose a random sample of reaction time measurements. The sample has a mean of 2. 4 seconds and a standard deviation of 0. 5 seconds. For each of the following sampling scenarios, choose an appropriate test statistic for our hypothesis test on the population mean. Then calculate that statistic. Round your answers to two decimal places. (a) The sample has size 110, and it is from a non-normally distributed population with a known standard deviation of. It is unclear which test statistic to use. (b) The sample has size 12,and it is from a normally distributed population with an unknown standard deviation. Z=
t=
It is unclear which test statistic to use.
(a) We will use the "t" as test-statistics and the value of "t" is t = -0.87.
(b) We will use "z" as the test-statistics and the value of "z" is z = -0.77.
In statistics, a test statistic is a numerical summary of a sample that is used to make an inference about a population parameter. It is calculated from the sample data and is used to test a hypothesis or to make a decision about some characteristic of the population.
Part (a) : In this case, we do not know the "standard-deviation",
the case in which standard-deviation is un-known, "t" is used as a "test-statistics.
The Standard-error-of-mean (SE) is = s/√n = 0.5/√19 = 0.1148.
So, "t" = (mean - 2.5)/SE,
Substituting the values,
We get,
t = (2.4 - 2.5)/0.1148 = -0.87.
Part (b) : In this case, we know the "standard-deviation",
The case in which standard-deviation is known, "z" is used as a "test-statistics.
The Standard-error-of-mean (SE) is = s/√n = 0.45/√12 = 0.1299.
So, "z" = (mean - 2.5)/SE,
Substituting the values,
We get,
z = (2.4 - 2.5)/0.1299 = -0.77.
Therefore, the value of "z" is -0.77.
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The given question is incomplete, the complete question is
We want to conduct a hypothesis test of the claim that the population mean time it takes drivers to react following the application of brakes by the driver in front of them is more than 2.5 seconds. So, we choose a random sample of reaction time measurements. The sample has a mean of 2.4 seconds and a standard deviation of 0.5 seconds.
For each of the following sampling scenarios, choose an appropriate test statistic for our hypothesis test on the population mean. Then calculate that statistic. Round your answers to two decimal places.
(a) The sample has size 19, and it is from a non-normally distributed population with an unknown standard deviation.
Which test-statistic will you use z, t or It is unclear which test statistic to use.
(b) The sample has size 12,and it is from a normally distributed population with an known standard deviation of 0.45.
Which test-statistic will you use z, t or It is unclear which test statistic to use.
1. Liz Reynolds deposited $2,000 into a savings account that pays 8 % compounded quarterly. Complete the table to compute the amount in the account after 1 year.
The amount at end of the second quarter = [tex]42,448$ +2122,416$ = 2164.86$[/tex]
How to solveInterest for first quarter = [tex]2000 * 0,08*- = 40$\n4[/tex]
Amount at end of first quarter =[tex]40$ + 2000$ = 2040$[/tex]
Interest for second quarter = [tex]2040 * 0,08\n1\n* = 40,8$\n4[/tex]
Amount at end of second quarter = [tex]40,8$ + 2040$ = 2080,8$[/tex]
Interest for third quarter = [tex]2080,8 * 0,08*\n4\n= 41,616$[/tex]
Amount at end of third quarter = [tex]41,616$ +2080,0$ = 2122,416$[/tex]
1\nInterest for second quarter = [tex]2122,416 * 0,08 *-\n4\n= 42,44831$[/tex]
Amount at end of second quarter = [tex]42,448$ +2122,416$ = 2164.86$[/tex]
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A cylinder has the net shown.
What is the surface area of the cylinder in terms of π?
40.28π in2
22.80π in2
18.62π in2
15.01π in2
Step-by-step explanation:
Each circle has area pi r^2 = (pi)( 1.9)^2 in ( 1.9 is the RADIUS)
there are two of them so total circle area = 2 pi (1.9)^2 in^2
Then there is the rectangle
one of its dimensions is the CIRCUMFERENCE of the circles
= pi * d = pi * 3.8 in
and the other dimension is 3
area of rectangle = pi * 3.8 * 3 in^2
Add all of the areas for the total area 2 pi (1.9)^2 + pi * 3.8*3 in^2 =
= 18.62 pi in^2
From 9 names on a ballot, a committee of 5 will be elected to attend a political national convention. How many different committees are possible? Use the empirical probability formula to solve the exercise
The number of different committees that are possible is: 126
How to solve Permutation and Combination?When you have a number of elements and then want to form subsets of elements of particular smaller size, you can utilize combinations or permutations. If the order of placement of the elements does not matter, we use combinations to quantify the number of groups formed.
Now, the order of the members in the committee does not matter and as such we will use combinations which has the formula:
nCr = n!/(r!(n - r)!)
We are given:
n = 9
r = 5
Thus:
9C5 = 9!/(5!(9 - 5)!)
= 126 different committees
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Jose has scored 347 points on his math tests so far this semester. To get an A for the semester, he must score at least 403 points. Part 1 out of 2 Enter an inequality to find the minimum number of points he must score on the remaining tests in order to get an A. Let n represent the number of points Jose needs to score on the remaining tests.
If Joe already scored 347 points in math-test, then to get a grade"A" he must score at least 56 marks, which is represented in inequality as n ≥ 56.
Jose has already scored 347 points on his math-tests so far, and he needs to score at least 403 points to get an A for the semester.
Let "minimum-points" he must score on the "remaining-tests" be denoted by "n". We can write an inequality to represent minimum-points as:
⇒ 347 + n ≥ 403,
⇒ n ≥ 403 - 347,
⇒ n ≥ 56.
Therefore, Jose must score at least 56 points on the remaining tests in order to get an A for the semester.
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The given question is incomplete, the complete question is
Jose has scored 347 points on his math tests so far this semester. To get an A for the semester, he must score at least 403 points. Write an inequality to find the minimum number of points he must score on the remaining tests in order to get an A. Let "n" represent the number of points Jose needs to score on the remaining tests.