The effect of the student presenting such a monologue would be B. The mean will decrease.
How to find the effect ?Order the data points:
1. 5, 1. 5, 2, 2. 5, 2. 5, 2. 5, 3, 3. 5, 3. 5, 4
Find the mean ;
= (1. 5 + 1. 5 + 2 + 2. 5 + 2. 5 + 2. 5 + 3 + 3. 5 + 3. 5 + 4) / 10
= 27 / 10
= 2. 7
Then find the new mean after the student presents the monologue:
= ( 0. 5 + 1. 5 + 1. 5 + 2 + 2. 5 + 2. 5 + 2. 5 + 3 + 3. 5 + 3. 5 + 4) / 11
= 2. 5
The mean therefore reduced.
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Answer:
b
Step-by-step explanation:
PLS HELP ME WITH THIS!!!!
Answer:
g(x) = h(x -7) +5
Step-by-step explanation:
Given h(x) defines a parabola that opens upward with a vertex at (-2, -7) and g(x) defines the same parabola with its vertex at (5, -2), you want to express g(x) in terms of h(x).
TranslationThe graph of f(x) is translated right h units and up k units by ...
f(x -h) +k
We see that g(x) is a translation of h(x) right by 7 units and up by 5 units. This means (h, k) is (7, 5), and the translated function is ...
g(x) = h(x -7) +5
__
Additional comment
This is confirmed by the plots in the second attachment.
Answer: g(x)=h(x-7) +5
Step-by-step explanation:
The graph g(x) has been shifted up 5 (+5) and right 7
When shift a function, the y change, up/down, goes at end of function
When shift in x direction happens, you take opposite sign so we will do -7
g(x)=h(x-7) +5
find the volume of the figure
Answer:
252 mi
Step-by-step explanation:
volume= L x W x H
9x 7 x 4 = 252 mi
I Need help with a Math Problem
What is the percent of change in 6 yards to 36 yards - - - 7th-grade math show the work
Answer:
Step-by-step explanation:
Rounded percent of change = 500.0% Therefore, the percent of change is an increase of 500.0%.
I think sorry if I’m wrong
Find the area of the surface obtained by rotating the curve of parametric equations x = 6 cos^3 θ, y = 6sin^3 θ, 0 ≤ θ ≤ π/2
The area of the surface obtained by rotating the curve of parametric equations x = 6 cos^3 θ, y = 6sin^3 θ, 0 ≤ θ ≤ π/2 is 96π/5 square units.
To find the area of the surface obtained by rotating the curve of parametric equations x = 6 cos^3 θ, y = 6sin^3 θ, 0 ≤ θ ≤ π/2, we can use the formula for surface area of revolution:
A = 2π ∫_a^b f(x) √(1+(f'(x))^2) dx
In this case, we need to first find the function y = f(x) that represents the curve. Using the given parametric equations, we can eliminate θ to get:
x = 6 cos^3 θ
x = 6 (1-sin^2 θ) cos^2 θ
y = 6 sin^3 θ
y = 6 (1-x/6)^(3/2)
So the function that represents the curve is y = 6 (1-x/6)^(3/2). Now we can use the formula for surface area of revolution:
A = 2π ∫_0^6 (6 (1-x/6)^(3/2)) √(1+(-3/4 (1-x/6)^(-1/2))^2) dx
A = 2π ∫_0^6 (6 (1-x/6)^(3/2)) √(1+9/16 (1-x/6)^(-1)) dx
A = 2π ∫_0^6 (6 (1-x/6)^(3/2)) √((25-9x)/(16(1-x/6))) dx
This integral can be evaluated using substitution and partial fractions. The final answer is:
A = 96π/5
Therefore, the area of the surface obtained by rotating the curve of parametric equations x = 6 cos^3 θ, y = 6sin^3 θ, 0 ≤ θ ≤ π/2 is 96π/5 square units.
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The domain of g(x) = log 56 - x) can be found by solving the inequality
A. 6-x<0 ,B. 6-x>0,C. 6-x>=0, D. 6-x<=0
The inequality to solve is 56 - x > 0. The solution is x < 56. Therefore, the domain of the function g(x) is x < 56. So, the answer is option B.
The function is defined as g(x) = log(56 - x).
The domain of a logarithmic function is all the values that make the argument of the logarithm positive. In other words, the argument of the logarithm (56 - x) must be greater than 0.
So, we solve the inequality 56 - x > 0 for x
56 - x > 0
Subtract 56 from both sides
-x > -56
Divide both sides by -1, and remember to reverse the inequality
x < 56
Therefore, the domain of the function g(x) is all real numbers x such that x < 56. So, the correct answer is B).
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--The given question is incomplete, the complete question is given
" The domain of g(x) = log 56 - x) can be found by solving the inequality
A. 56-x<0 ,B. 56-x>0,C. 56-x>=0, D. 56-x<=0 "--
What is the surface area of the triangular prism?
6. 5 ft 8ft 6ft 2. 5ft
115
120
135
159
The surface area of the first triangular prism is 174.58 square feet and second triangular prism is 1721.6 square feet.
How to calculate the surface area?To calculate the surface area of a triangular prism, we need the measurements of the base and the height of the triangular bases, as well as the length of the prism.
For the first triangular prism with measurements:
Base: 5 ft
Height: 8 ft
Length: 6 ft
To calculate the surface area, we need to find the areas of the two triangular bases and the three rectangular faces. The formula for the surface area of a triangular prism is:
Surface Area = 2 * (Area of triangular base) + (Perimeter of triangular base * Length)
The area of a triangle can be calculated using the formula: Area = 1/2 * Base * Height.
Area of triangular base = 1/2 * 5 ft * 8 ft = 20 ft²
The perimeter of a triangle is the sum of its three sides.
Perimeter of triangular base = 5 ft + 8 ft + √(5 ft² + 8 ft²) = 5 ft + 8 ft + √89 ft ≈ 5 ft + 8 ft + 9.43 ft ≈ 22.43 ft
Surface Area = 2 * 20 ft² + (22.43 ft * 6 ft) = 40 ft² + 134.58 ft² = 174.58 ft²
Therefore, the surface area of the first triangular prism is approximately 174.58 square feet.
For the second triangular prism with measurements:
Base: 6 ft
Height: 2.5 ft
Length: 115 ft
Area of triangular base = 1/2 * 6 ft * 2.5 ft = 7.5 ft²
Perimeter of triangular base = 6 ft + 2.5 ft + √(6 ft² + 2.5 ft²) = 6 ft + 2.5 ft + √40.25 ft ≈ 8.5 ft + 6.34 ft ≈ 14.84 ft
Surface Area = 2 * 7.5 ft² + (14.84 ft * 115 ft) = 15 ft² + 1706.6 ft² = 1721.6 ft²
Therefore, the surface area of the second triangular prism is approximately 1721.6 square feet.
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The surface area of the triangular prism is x - 0 = -3
Find out the surface area of the triangular prism?If the solution to an absolute value equation is x = -3, then we know that the distance between x and 0 is 3 units. Since the absolute value of a number is the distance between the number and 0 on the number line, we can write the absolute value equation that corresponds to x = -3 as:
| x - 0 | = 3
To write this equation in the form x - b = c, we can simplify the absolute value expression by removing the absolute value bars. This gives us two possible equations:
x - 0 = 3 or x - 0 = -3
Simplifying further, we get:
x = 3 or x = -3
Therefore, the absolute value equation in the form x - b = c that has the solution set {x = -3} is:x - 0 = -3
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Solve for x. Round to the nearest tenth of a degree, if necessary.
Answer:
40.7, my answer needs to be 20+ characters sooo....
The final exam scores in a statistics class were normally distributed with a mean of
63 and a standard deviation of five.
find the score that marks the 11% of all scores.
The score that marks the 11% of all scores is approximately 56.875 .
To find the score that marks the 11% of all scores, we need to use the standard normal distribution table, also known as the Z-table, since the given distribution is a normal distribution.
The first step is to find the Z-score that corresponds to the 11th percentile, which is given by: Z = invNorm(0.11) ≈ -1.225
Here, "invNorm" represents the inverse of the standard normal cumulative distribution function, which can be computed using statistical software or a calculator.
The second step is to use the Z-score formula to find the raw score that corresponds to this Z-score:Z = (X - μ) / σ
where X is the raw score we want to find, μ is the mean of the distribution, and σ is the standard deviation. Plugging in the values we have:
-1.225 = (X - 63) / 5
Solving for X, we get:
X = -1.225 * 5 + 63 = 56.875
Therefore, the score that marks the 11% of all scores is approximately 56.875
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Area The measurement of the side of a square floor tile is 10 inches, with a possible error of 1/32 inch.
(a) Use differentials to approximate the possible propagated error in computing the area of the square. (b) Approximate the percent error in computing the area of the square.
The possible propagated error in computing the area of the square is between 19/32 and 21/32 square inches.
How to calculate the error propagation?
(a) Let A be the area of the square tile. The differential of A with respect to the side length x is dA/dx = 2x.
dA ≈ (dA/dx)dx
At the lower end of the possible range for x, we have:
x = 9 31/32 inches
dx = 1/32 inch
dA = (2x)(dx) = (2(9 31/32))(1/32) = 19/32 square inches
At the upper end of the possible range for x, we have:
x = 10 1/32 inches
dx = 1/32 inch
dA = (2x)(dx) = (2(10 1/32))(1/32) = 21/32 square inches
Therefore, the possible propagated error in computing the area of the square is between 19/32 and 21/32 square inches.
(b) The percent error in computing the area of the square is given by:
(percent error) = (error / actual value) x 100
(percent error) = [(21/32 - 100) / 100] x 100% = -79/1600 x 100% ≈ -4.94%.
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The surface area of a rectangular prism is 335 ft2. If the area of the base is 21 ft2, and the perimeter of the base is 20 ft. What is the height of the prism? Round
your answer to the tenths.
Given that BC is tangent to circle A and that BC=3 and AB=5. Calculate
the length of the radius of circle A
The radius of circle A is 4.
From the given information, we can draw a right triangle ABC where BC is the tangent to circle A at point C, AB is the hypotenuse, and AC is the radius of the circle. By the Pythagorean theorem, we have:
AC² + BC² = AB²
Substituting the given values, we get:
AC² + 3² = 5²
AC² = 25 - 9
AC² = 16
Taking the square root of both sides, we get:
AC = 4
Therefore, the length of the radius of circle A is 4.
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I have some coins in my pocket. Nickles and pennies I have a total of $. 41 I have 21 coins in total. How many Nickles and pennies do I have?
The number of nickels and pennies in the pocket is 5 and 16 respectively.
How to find the number of coins?To find the number of coins, Let's assume the number of nickels is x and the number of pennies is y.
According to the problem, we have two equations:
The total value of the coins is $0.41:
0.05x + 0.01y = 0.41
The total number of coins is 21:
x + y = 21
Now we can solve this system of equations to find x and y. One way to do this is to use substitution.
Solving the second equation for y, we get:
y = 21 - x
Substituting this into the first equation, we get:
0.05x + 0.01(21 - x) = 0.41
Simplifying:
0.05x + 0.21 - 0.01x = 0.41
0.04x = 0.2
x = 5
So we have 5 nickels.
Substituting this into the equation y = 21 - x, we get:
y = 21 - 5 = 16
So we have 16 pennies.
Therefore, the number of nickels and pennies in the pocket is 5 and 16 respectively.
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Aleks and Melanie used a protractor to measure the angle below. Aleks thinks the angle measures 50° but Melanie says it is actually 130°. Their teacher confirms that Melanie has the correct answer. What mistake did Aleks make while measuring the angle?
The mistake, Aleks made, while measuring the angle is, he measure the angle from the wrong side of the line.
Angle is a dimensionless vector quantity, that is, it is very important, to take care of the directions, while measuring the angle.
That is, to measure the angle, say ∠ABC, the 0°(reference) line of the protractor, must be on one either AB or BC, to measure the angle rightly.
And since the angles between two lines are supplementary in nature, that is, the two angles will add up to make 180°, that is why, the angle measure by Alek and Melanie, add up to make 180°.
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Menlo Company distributes a single product. The company's sales and expenses for last month follow:
Per Unit
$ 40
28
$ 12
Sales
Variable expenses
Contribution margin
Fixed expenses
Net operating income
Total
$ 600,000
420,000
180,000
Required:
1. What is the monthly break-even point in unit sales and in dollar sales?
2. Without resorting to computations, what is the total contribution margin at the break-even point?
3-a. How many units would have to be sold each month to attain a target profit of $70,800?
3-b. Verify your answer by preparing a contribution format income statement at the target sales level.
146,400
$ 33,600
4. Refer to the original data. Compute the company's margin of safety in both dollar and percentage terms.
5. What is the company's CM ratio? If the company can sell more units thereby increasing sales by $69,000 per month and there is no
change in fixed expenses, by how much would you expect monthly net operating income to increase?
Complete this question by entering your answers in the tabs below.
Req 1
Margin of safety
Req 3A
Req 3B
Req 2
Req 5
Refer to the original data. Compute the company's margin of safety in both dollar and percentage terms. (Round your
percentage answer to 2 decimal places (i.e. 0.1234 should be entered as 12.34).)
Dollars
Percentage
Req 4
%
If sales increase by 66,000, income will increase by 220,000.00
Net operating income 37,200.00
The margin of safety is 14.01%
How to solveStatement showing Computations
particulars Amount Per unit
Sales 628,000.00 40.00
Variable Expenses 439,600.00 28.00
Contribution Margin 188,400.00 $ 12.00
Fixed Expenses 151,200.00
Net operating income 37,200.00
'
1) BEP in unit sales = 151,200/12 12,600.00
.BEP in sales $ = 12,600 * 40 504,000.00
2) Total Contribution margin at BEP = Fixed costs 151,200.00
3)a Target Profit $ 64,800.00
Fixed Expenses 151,200.00
Desired Contribution 216,000.00
3b. No of units to be sold = 216,000/12 18,000.00
Sales 720,000.00
Variable Expenses 504,000.00
Contribution Margin 216,000.00
Fixed Expenses 151,200.00
Net operating income 64,800.00
4) Margin of safety = 628,000.00-540,000.00 88,000.00
MOS in % = 88,000/6280001 14.01%
5)CM Ratio = 188,400/628,000 0.3
If sales increase by 66,000, income will increase by 220,000.00
66,000/0.3
=220,000.
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7z+9z+7-7 =180 How do
You solve this
The solution for the given linear expression is 11.25 (45/4).
Linear Expression
A linear expression can be represented by a line. The standard form for this equation is: y=mx+b , for example, y=11x+9. Where:
m= the slope.
b= the constant term that represents the y-intercept.
For the given example: m=11 and b=9.
The question gives the expression:7z+9z+7-7 =180. Then, you should find the variable z.
7z+9z+7-7 =180
16z+0=180
16z=180
z=180/16=90/8=45/4=11.25
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Solve systems of equation by the substitution method.
a - 3 = 2b
4a + 5b- 8 = 0
The value of the variables are a = 1 and b = -1
How to solve the equationGiven that the equations are;
a - 3 = 2b
4a + 5b- 8 = 0
Using the substitution method, we have;
Make 'a' the subject of formula from equation (1)
a = 2b + 3
Now, substitute the value of the variable in the second equation
4(2b + 3) + 5b - 8 = 0
expand the bracket, we have;
8b + 12 + 5b - 8 = 0
collect the like terms, we get;
8b + 5b = 0 - 5
add or subtract the values
5b = -5
b = -1
Substitute the value of b as =-1
a = 2(-1) +3
expand the bracket
a = -2 + 3
a = 1
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Keisha's teacher gives her the following information: • m, n, p, and q are all integers and p = 0 and q + 0 m and B= 4 What conclusion can Keisha make? A + B = so the sum of two rational numbers is a rational number. AB= so the product of two rational numbers is a rational number. A + B = so the sum of a rational number and an irrational number is an irrational number. A. BE so the product of two irrational numbers is an irrational number.
Option C is correct i.e. A+B= (mp + nq)/pq, so the sum of two rational numbers is a rational number.
Given integers are m, n, p and q
And q ≠ 0 and p ≠ 0
A = m / p
B = n/ q
Adding A and B
A + B = m / p + n / q
A + B = (mq + np) / pq
as p ≠ 0 and q ≠ 0 so, pq ≠ 0
So, A + B = (mq + np) / pq is a rational number
Therefore, option C is correct i.e. A+B= (mp + nq)/pq, so the sum of two rational numbers is a rational number.
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Given question is incomplete, the complete question is below:
Keisha's teacher gives her the following information:
• m, n, p, and q are all integers, and p≠ 0 and q≠0
•A= m/q and B= n/p
What conclusion can Keisha make?
A: A +B = (mp + nq)/pq, so the sum of a rational number and an irrational number is an irrational number.
B: A•B= (mp + nq)/pq, so the product of two irrational numbers is an irrational number.
C: A+B= (mp + nq)/pq, so the sum of two rational numbers is a rational number.
D: A•B= (mp + nq)/pq, so the product of two rational numbers is a rational number.
Can someone help me asap? It’s due today!!
John would have the option of taking 10 different cones
How to solve for the coneThe questions says that there is the option of having the flavors that are available ice cream flavors are: chocolate (C), mint chocolate chip (M), strawberry (S), rainbow sherbet (R), and vanilla (V).
The available flavors are then 5 in number
Then the number of scoops that he can have from each of the cone is said to be 2
Hence we would have 5 x 2
= 10
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Please help :D
A. Explain how to make a prediction based on the probability of an event.
B. Then, give an example in which predictions are made based on probabilities
This prompt is about probability. The answers are given as follows;
Identifying the probability of an event is crucial to making predictions based on its likelihood. T his involves calculating the probability either through historical data or experimentation.
Once determined, utilizing this value enables one to make future predictions regarding the occurrence of such events; for instance, 80% probability of precipitation tomorrow implies an 80% chance of rain.
Calculating probabilities has proven essential to sports betting because it helps bookmakers given some degree of foresight on which teams are going to win specific games or tournaments. Operating under the premise that there will always be two probable outcomes (either one side wins while another loses), these bookmakers could assign numerical values on what percentage they deem worthy enough for each team's chances.
Subsequently, using precise mathematical formulas and equations, bettors assess wagering-related uncertainties based on these predetermined likelihoods before deciding whether or not they should place money bets.
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In a 2 digit number the tens digit is 5 less than the units digit. The number itself is 5 more tha 3 times the sum of its digits. What is the number
Answer:
Step-by-step explanation:
(2-5)3=-9. (-9)5 =-45
A fair six-sided die will be rolled fifteen times, and the numbers that land face up will be recorded. Let x¯1 represent the average of the numbers that land face up for the first five rolls, and let x¯2 represent the average of the numbers landing face up for the remaining ten rolls. The mean μ and variance σ2 of a single roll are 3. 5 and 2. 92, respectively. What is the standard deviation σ(x¯1−x¯2) of the sampling distribution of the difference in sample means x¯1−x¯2?
The mean of a single roll is given as μ = 3.5, and the variance is given as [tex]σ^2[/tex] = 2.92.
The sample size for the first five rolls is n1 = 5, and the sample size for the remaining ten rolls is n2 = 10.
The mean of the sampling distribution of the difference in sample means x¯1−x¯2 is given as:
μ(x¯1−x¯2) = μ(x¯1) - μ(x¯2) = μ - μ = 0
The variance of the sampling distribution of the difference in sample means x¯1−x¯2 is given as:
σ^2(x¯1−x¯2) = (σ^2(x¯1)/n1) + (σ^2(x¯2)/n2)
where σ^2(x¯1) is the variance of the sample mean for the first five rolls and σ^2(x¯2) is the variance of the sample mean for the remaining ten rolls.
Since each roll of the die is independent, the variance of the sample mean for each sample is given as:
σ^2(x¯1) = σ^2/ n1 = 2.92/5 = 0.584
σ^2(x¯2) = σ^2/ n2 = 2.92/10 = 0.292
Substituting these values in the above equation, we get:
σ^2(x¯1−x¯2) = (0.584/5) + (0.292/10) = 0.1468
Therefore, the standard deviation of the sampling distribution of the difference in sample means x¯1−x¯2 is:
σ(x¯1−x¯2) = sqrt(σ^2(x¯1−x¯2)) = sqrt(0.1468) = 0.3835 (rounded to four decimal places)
Hence, the standard deviation of the sampling distribution of the difference in sample means x¯1−x¯2 is 0.3835.
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The Volume, V, in liters, of air in the lungs is approximated by the the model, V = -0.0374+3 +0.1525+2 +0.1729t, during a five second respiratory cycle. In here, t is measured in second
The model approximates the volume, V, in liters, of air in the lungs during a five-second respiratory cycle using the equation V = -0.0374t + 3 + 0.1525t^2 + 0.1729t.
The given equation represents a mathematical model for estimating the volume of air in the lungs during a respiratory cycle. It is a quadratic equation with three terms: -0.0374t, 0.1525t^2, and 0.1729t.
The term -0.0374t represents the linear decrease in volume over time, indicating that the volume decreases by 0.0374 liters for every second of the respiratory cycle.
The term 0.1525t^2 represents the quadratic relationship between volume and time squared, indicating that the rate of change of volume with respect to time is influenced by the square of time.
The term 0.1729t represents the linear increase in volume over time, indicating that the volume increases by 0.1729 liters for every second of the respiratory cycle.
Overall, this model provides an approximation of the volume of air in the lungs during a five-second respiratory cycle, taking into account both linear and quadratic relationships with time.
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You invest $5400 in an account that pays 7% compounded continuously, how many years would it take to reach $8000?
It would take approximately 7.62 years to reach $8000 if $5400 is invested in an account that pays 7% compounded continuously.
The formula for calculating the future value (FV) of an investment that is continuously compounded is FV = Pe^(rt), where P is the principal amount, r is the annual interest rate, and t is the time in years. In this case, P = $5400, r = 7% = 0.07, and FV = $8000. Substituting these values into the formula, we get:
$8000 = $5400e^(0.07t)
Dividing both sides by $5400 and taking the natural logarithm of both sides, we get:
ln(8000/5400) = 0.07t
Simplifying the left side of the equation, we get:
ln(4/3) = 0.07t
Solving for t, we get:
t = ln(4/3)/0.07 ≈ 7.62 years
Therefore, it would take approximately 7.62 years to reach $8000 if $5400 is invested in an account that pays 7% compounded continuously.
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I NEED HELP ON THIS ASAP!! IT'S DUE TODAY!!
The transformations performed on f(x) to create g(x) is a reflection over the y-axis and a translation 4 units up.
An equation for g(x) in terms of f(x) is g(x) = f(-x) + 4.
What is a reflection over the y-axis?In Mathematics and Geometry, a reflection over or across the y-axis or line x = 0 is represented and modeled by this transformation rule (x, y) → (-x, y).
By applying a reflection over the y-axis to coordinate A of the image ABCD, we have the following:
(x, y) → (-x, y)
Coordinate = (-1, 1/10) → Coordinate A' = (-(-1), 1/10) = (1, 1/10).
Furthermore, the transformation rule for the translation of a point by k units up is given by;
(x, y + k) → (x', y')
(1, 1/10 + k) → E(1, 4 1/10)
1/10 + k = 4 1/10
k = 4 1/10 - 1/10
k = 4.
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145 student are in the auditorium. Of the students in the auditorium, about 86% of the students play a sport. About 45% of the students are in the school play. How many students play a sport? How many students are in the play? Round your answer to the nearest whole
About 125 students play a sport and about 65 students are in the play.
To find the number of students who play a sport and those who are in the play, we need to use the given percentages and round the answers to the nearest whole.
Find the number of students who play a sport:
Multiply the total number of students (145) by the percentage of students who play a sport (86%).
145 × 0.86 = 124.7
Round the answer to the nearest whole number:
Approximately 125 students play a sport.
Find the number of students who are in the play:
Multiply the total number of students (145) by the percentage of students who are in the play (45%).
145 × 0.45 = 65.25
Round the answer to the nearest whole number:
Approximately 65 students are in the play.
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Assume there are 0. 9 U. S. Dollars in a Canadian dollar. If gasoline costs 1. 50 Canadian dollars per liter, how many U. S. Dollars does it cost to buy a gallon of gas in Canada? (1 gallon = 3. 8 liters)
a. $3. 28
b. $5. 13
c. $2. 95
d. $5. 68
5.13 U. S. Dollars will it cost to buy a gallon of gas in Canada. The correct answer to the question is A
Given in the question,
Cost of 1 liter gasoline = 1.50 Canadian dollars
1 gallon = 3.8 liters
Thus, to calculate the price of 1 gallon we multiply the cost of 1 liter by 3.8
Cost of 3.8 liters of gasoline = 1.5 * 3.8
= 5.70 Canadian dollars
1 Canadian dollar = 0.9 U. S. dollars
5.70 Canadian dollars = 5.70 * 0.9
= 5.13 U. S. dollars
That is the cost of 1 gallon of gas in Canada is 5 U S dollars and 13 cents.
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Write a system of equations to describe the situation below, solve using any method, and fill in the blanks.
When Ellen does 19 push-ups and 8 sit-ups, it takes a total of 43 seconds. In comparison, she needs 48 seconds to do 12 push-ups and 12 sit-ups. How long does it take Ellen to do each kind of exercise?
It takes Ellen _ seconds to do a push-up and _seconds to do a sit-up.
Thank you :
Answer:
push-up = 1 second
sit-up = 3 seconds
Step-by-step explanation:
let p represent the # of push-ups
let s represent the # of sit-ups
System of equations:
19p+8s=43
12p+12s=48
i'll eliminate s by multiplying the top equation by 3 and the bottom equation by -2
57p+24s=129
-24p-24s=-96
33p=33
p=1 second
now solve for s (i'll plug p into the 2nd equation)
12(1) + 12s=48
12s=36
s=3 seconds
GARDENING A gardener is selecting plants for a special display. There are 15 varieties of pansies from which to choose. The gardener can only use 9 varieties in the display. How many ways can 9 varieties be chosen from the 15 varieties?
Answer:
5,005
Step-by-step explanation:
This is a combination problem. The formula for combination is:
nCr = n! / (r!(n-r)!)
Where n is the total number of items, and r is the number of items to be selected.
Using this formula, we can calculate the number of ways to choose 9 varieties from 15:
15C9 = 15! / (9!(15-9)!) = 5005
Therefore, there are 5,005 ways to choose 9 varieties from 15 varieties of pansies.
Kristen is trying to determine the x-intercepts of the graph of a quadratic function. Which form would be the most beneficial in order for Kristen to quickly identify the coordinates? A. Standard Form B. Intercept Form C. Vertex Form
The form in which is easier to identify the x-intercepts is the one in option B. Intercept form.
Which form would be the most beneficial in order for Kristen to quickly identify the coordinates?If a quadratic equation has a leading coefficient a and x-intercepts x₁ and x₂, then the quadratic equation can be written as:
y = a*(x - x₁)*(x - x₂)
That is called the factored form or the intercept form.
Notice that if the quadratic equation is written in that form, is really easy to identify the x-intercepts of the equation, then that would be the most beneficial form in order for Kristen to quickly identify the coordinates, the correct option is B.
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