Answer:
$4.04
Step-by-step explanation:
$3.15+$1.25=y
y is our variable
so,3.15
+ 1.25
4.04
You want to install new carpet in your room.
1. Measure your room and figure the square footage.
2. Figure out which company is the best value.
3. You will answer over the next 3 slides.
* Carpet World has a flat fee of $6 per square foot. y=6x
*Floors & More has an up front fee of $125 plus $4.50 per square foot. y=4.5x+125
The solution to the given system of equations is (83.3, 499.8).
Given that, Carpet World has a flat fee of $6 per square foot.
That is, y=6x --------(i)
Floors & More has an up front fee of $125 plus $4.50 per square foot.
That is, y=4.5x+125 --------(ii)
From the given equations (i) and (ii), we get
6x=4.5x+125
6x-4.5x=125
1.5x=125
x=125/1.5
x=83.3
Substitute x=83.3 in equation (i), we get
y=6x
y=6×83.3
y=499.8
Therefore, the solution to the given system of equations is (83.3, 499.8).
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Please math is rally hard can someone help me? I’m struggling so bad right now
Explanation:
The two interior angles 55 and 6x+8 add to the exterior angle 14x-1; this exterior angle is not adjacent to the interior angles mentioned.
Refer to the Remote Interior Angle Theorem for more information.
So,
55+(6x+8) = 14x-1
6x+63 = 14x-1
6x-14x = -1-63
-8x = -64
x = -64/(-8)
x = 8
Then we can determine angle T
angle T = 6x+8 = 6*8+8 = 56 degrees
Show that the flux of F =e_{r}/r^2 through a sphere centered at the origin does not depend on the radius of the sphere.
Let S be and show is a sphere of radius R centered at the arigin. We will compare the flux that it does not depends on R. Parametic equation of sphare Y(4,0)= Rsind caso + Rsind sine j + R Cord F
and 014≤ 640 ≤ 2TT outward normal is
(r = 18) = √x² + y²+z2)
= F = ૪ 3
flux = [[Finds
. Rsing dodo = 83
(from put value of n
13 sind do do 23
2 TT, TT sing do do
R 11 R [["e. / sind dado (r= 171 = radius of ephare)
Π 2T ए [e" [" sind do do= ["- Casp" "do 0
[-(-1-1) do 2TT = 2x (2-0) 2 = do flux
flux = [[F·ñ-ds S = 4π
The flux is 411 and it depends on radius 'R'
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Calculate the test statistic 2
A local retailer currently schedules employees based on the assumption that they serve customers uniformly throughout the week (the same number each day). Management is starting to question this assumption and decides to collect data on the number of customers served each day of the week to
perform a Chi-Square goodness-of-fit test at a 5% significance level.
Monday Tuesday Wednesday Thursday Friday
Number Served 40 33 35 32 60
Total 200
Provided the assumptions of the test are satisfied, calculate the test statistic 2
The value of a Chi-Square goodness-of-fit test at a 5% significance level is 13.45
We need to perform a Chi-Square goodness-of-fit test at a 5% significance level.
First we need to calculate the expected count
expected value = ∑(x)/n
= (40 + 33 + 35 + 32 + 60)/5
= 200/5
= 40
Now we need tocalculate the test statistic value
Observed expected O - E (O - E)^t/E %
40 40 0 0 0
33 40 -7 1.225 9.11
35 40 -5 0.625 4.65
32 40 -8 1.6 11.90
60 40 20 10 74.35
Chi square test is 13.45
Therefore, the value of test statistics is 13.45.
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2. The equation y = -7x - 5 and another equation have a solution of (-2, 9). Which of the
following could be the second equation?
Oy= *x + 10
O y=2x+5
Oy=-*+7
O y=3x-3
two cards are drawn (without replacement) from an ordinary deck of 52 playing cards. what is the probability that these two cards is a pair?
Answer:
The probability that the two cards drawn form a pair is approximately 0.045.
Explanation:
There are 52 cards in an ordinary deck, and each card has a unique rank (ace, 2, 3, 4, 5, 6, 7, 8, 9, 10, jack, queen, or king) and suit (spades, hearts, diamonds, or clubs). There are 13 ranks and 4 suits, so there are 13*4 = 52 possible cards in the deck.
When we draw two cards without replacement, there are 52 ways to draw the first card and 51 ways to draw the second card, for a total of 5251 = 2652 possible outcomes. Of these, there are 4 ways to draw a pair of cards with the same rank (for example, 2 of spades and 2 of hearts) and 13 ranks to choose from, so there are 413 = 52 pairs in the deck. Therefore, the probability of drawing a pair is 52/2652 = 1/51, or approximately 0.0196.
Alternatively, we can calculate the probability by considering the complement of the event (that is, the probability of not drawing a pair). There are 48 non-pair cards in the deck (since there are 52 total cards and 4 pairs), and there are 48*47 = 2256 ways to draw two non-pair cards. Therefore, the probability of not drawing a pair is 2256/2652 = 48/51, or approximately 0.931. The probability of drawing a pair is then 1 - 0.931 = 0.069, or approximately 0.045.
Either way, we can see that the probability of drawing a pair is relatively low, at about 4.5%.
in 2005 the population of a district was 35,700 with a continuous annual growth rate of approximately 4%, what will the population be in 2030 according to the exponential growth function?
The population of a district in 2005 was 35,700 with a continuous annual growth rate of approximately 4%. the population in 2030 will be approximately 97,209 according to the exponential growth function.
The formula for the continuous exponential growth is given by the formula:
P = Pe^(rt)
where,P is the population in the future.
P0 is the initial population.
t is the time.
r is the continuous interest rate expressed as a decimal.
e is a constant equal to approximately 2.71828.In this problem, the initial population P0 is 35,700. The rate r is 4% or 0.04 expressed as a decimal. We want to find the population in 2030, which is 25 years after 2005.
Therefore, t = 25.We will now use the formula:
P = Pe^(rt)P = 35,700e^(0.04 × 25)P = 35,700e^(1)P = 35,700 × 2.71828P = 97,209.09.
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Answer: I got 97,042.7
Step-by-step explanation:
Suppose that X is a random variable with mean 20 and standard deviation 4. Also suppose that Y is a random variable with mean 40 and standard deviation 7. Find the mean and the variance of the random variable Z for each of the following cases. Be sure to show your work.
(a) Z = 40 - 5X
(b) Z = 15X - 20
(c) Z = X + Y
(d) Z = X - Y
(e) Z = -2X + 3Y
(a) The mean of Z in case (a) is -60 and the variance is 400.
(b) The mean of Z in case (b) is 280 and the variance is 3600.
(c) The mean of Z in case (c) is 60 and the variance is 65.
(d) The mean of Z in case (d) is -20 and the variance is 65.
(e) The mean of Z in case (e) is 80 and the variance is 505.
To find the mean and variance of the random variable Z for each case, we can use the properties of means and variances.
(a) Z = 40 - 5X
Mean of Z:
E(Z) = E(40 - 5X) = 40 - 5E(X) = 40 - 5 * 20 = 40 - 100 = -60
Variance of Z:
Var(Z) = Var(40 - 5X) = Var(-5X) = (-5)² * Var(X) = 25 * Var(X) = 25 * (4)² = 25 * 16 = 400
Therefore, the mean of Z in case (a) is -60 and the variance is 400.
(b) Z = 15X - 20
Mean of Z:
E(Z) = E(15X - 20) = 15E(X) - 20 = 15 * 20 - 20 = 300 - 20 = 280
Variance of Z:
Var(Z) = Var(15X - 20) = Var(15X) = (15)² * Var(X) = 225 * Var(X) = 225 * (4)² = 225 * 16 = 3600
Therefore, the mean of Z in case (b) is 280 and the variance is 3600.
(c) Z = X + Y
Mean of Z:
E(Z) = E(X + Y) = E(X) + E(Y) = 20 + 40 = 60
Variance of Z:
Var(Z) = Var(X + Y) = Var(X) + Var(Y) = (4)² + (7)² = 16 + 49 = 65
Therefore, the mean of Z in case (c) is 60 and the variance is 65.
(d) Z = X - Y
Mean of Z:
E(Z) = E(X - Y) = E(X) - E(Y) = 20 - 40 = -20
Variance of Z:
Var(Z) = Var(X - Y) = Var(X) + Var(Y) = (4)² + (7)² = 16 + 49 = 65
Therefore, the mean of Z in case (d) is -20 and the variance is 65.
(e) Z = -2X + 3Y
Mean of Z:
E(Z) = E(-2X + 3Y) = -2E(X) + 3E(Y) = -2 * 20 + 3 * 40 = -40 + 120 = 80
Variance of Z:
Var(Z) = Var(-2X + 3Y) = (-2)² * Var(X) + (3)² * Var(Y) = 4 * 16 + 9 * 49 = 64 + 441 = 505
Therefore, the mean of Z in case (e) is 80 and the variance is 505.
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Chelsea shows her work in finding the solution to 4x−5=2 3(x−3). after checking her answer in the original equation, she found that it did not work. where did she make a mistake?
Chelsea made a mistake in simplifying the equation 3(x-3). To find the solution to 4x-5=2(3(x-3)), we first simplify the expression inside the parentheses.
Now, to isolate the variable x, we need to move the terms with x to one side of the equation. Let's subtract 4x from both sides, which gives us -5-4x=6x-18-4x. Simplifying this, we get -5-4x=2x-18.
Next, let's move the constant terms to the other side. Adding 18 to both sides, we get -5-4x+18=2x-18+18. Simplifying this, we get -4x+13=2x.
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Chelsea made a mistake when subtracting the variable term from both sides. By identifying this error and correctly following the steps, we find that the solution to the equation 4x - 5 = 2 3(x - 3) is x = -7.
Chelsea made a mistake in her work when finding the solution to the equation 4x - 5 = 2 3(x - 3). To determine where she went wrong, let's analyze her steps.
Step 1: Distribute 3 to (x - 3): 4x - 5 = 2 3x - 6.
Step 2: Combine like terms: 4x - 5 = 6x - 12.
Step 3: Move the variables to one side and the constants to the other side. Chelsea may have mistakenly subtracted 4x from both sides instead of 6x. This would result in: -5 = 2x - 12.
Step 4: Solve for x. Chelsea may have then incorrectly added 12 to both sides instead of adding 5, leading to: 7 = 2x.
Step 5: Divide both sides by 2: x = 7/2.
Upon reviewing her work, Chelsea should have subtracted 6x from both sides in Step 3, not 4x. This would have resulted in the equation 2x - 5 = -12. Correctly following the steps would lead to the correct solution: x = -7.
Therefore, Chelsea made a mistake when subtracting the variable term from both sides. By identifying this error and correctly following the steps, we find that the solution to the equation 4x - 5 = 2 3(x - 3) is x = -7.
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Which of the following is equivalent to the complex number i^7
Answer:-i
Step-by-step explanation: :)
3/8 + 1/8 - 1/3 + 1/4 =
Answer:
0.41666666, to round up, the answer is 0.42
Step-by-step explanation:
\( \frac{3}{8} + \frac{1}{8} - \frac{1}{3} + \frac{1}{4} = \frac{4}{8} - \frac{1}{3} = \frac{4}{24} + \frac{1}{4} = \frac{10}{24} = \frac{5}{12} \)
How do you split a sentence into two simple sentences?
To split a sentence into two simple sentences, first, highlight the clauses while dividing sentences. When necessary, add subjects or other words in place of subordinating liners to make sub-clauses autonomous.
In the given question we have to explain how we split a sentence into two simple sentences.
As we know that;
A basic sentence typically consists of a subject, a verb, and maybe an object and modifiers. It only has one independent clause, though. Here are a few illustrations: She composed.
First, highlight the clauses while dividing sentences. When necessary, add subjects or other words in place of subordinating liners to make sub-clauses autonomous.
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Tim's lawn in 20 meters by 30 meters. If Tim can mow 8 square meters of grass per minute, how long will it take him to mow the lawn.
Answer:
75
Step-by-step explanation:
20x30=600/8=75
A rectangular prism has a base that is 5 cm by 7 cm and a height of 12 cm. If all dimensions are doubled, what happens to the volume?
When the dimensions are doubled, the volume is twice the original volume.
When the dimensions are doubled, the volume is three times the original volume.
When the dimensions are doubled, the volume is four times the original volume.
When the dimensions are doubled, the volume is eight times the original volume.
Answer: When the dimensions are doubled, the volume is eight times the original volume.
Step-by-step explanation:
Volume right now: 420 cm³
If we double all the dimensions, then the new specifications are 10, 14, and 24 inches respectively. This means that the new volume will be 3360cm³.
The relationship between the new volume and the old volume are: 3360/420 = 8
So the new volume is 8 times the original volume. Your answer is the last option
Answer:
The answer is D
Step-by-step explanation:
7 less than 5 times a number
Answer:
5x-7
Step-by-step explanation:
5 times x (a number) subtract 7
A test used to determine whether or not first-order autocorrelation is present is _____ test.
a. chi-square
b. t
c. Durbin-Watson
d. serial-autocorrelation
The test used to determine whether or not first-order autocorrelation is present is the Durbin-Watson test.
1. Fit a regression model to the data.
2. Obtain the residuals, which represent the differences between the observed values and the predicted values from the regression model.
3. Calculate the Durbin-Watson statistic, which is a ratio of the sum of squared differences between adjacent residuals to the sum of squared residuals.
4. Compare the calculated Durbin-Watson statistic to critical values from a Durbin-Watson table or use statistical software to determine if there is significant autocorrelation.
5. The Durbin-Watson statistic ranges from 0 to 4, where a value around 2 suggests no autocorrelation, a value below 2 indicates positive autocorrelation, and a value above 2 indicates negative autocorrelation.
6. By analyzing the Durbin-Watson statistic, researchers can make conclusions about the presence or absence of first-order autocorrelation in the regression model.
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B = 75*
C = 50*
A = ?*
Answer: A = 55* or 55 degrees
Step-by-step explanation:
The interior angles of a triangle always have a sum of 180 degrees.
75 + 50 + x = 180
Solve for x
FInal answer: 55 degrees
hope i explained it :)
A time-series study of the demand for higher education, using tuition charges as a price variable, yields the following result: (dq/dp) x (p/q) = -0.4
where p is tuition and q is the quantity of higher education. Which of the following is suggested by the result?
(A) As tuition rises, students want to buy a greater quantity of education. (B) As a determinant of the demand for higher education, income is more important than price.
(C) If colleges lowered tuition slightly, their total tuition receipts would increase.
(D) If colleges raised tuition slightly, their total tuition receipts would increase.
(E) Colleges cannot increase enrollments by offering larger scholarships.
the result is (D) If colleges raised tuition slightly, their total tuition receipts would increase.
The formula (dq/dp) x (p/q) = -0.4 is the elasticity of demand equation for higher education. It shows that the percentage change in quantity demanded (dq/q) due to a percentage change in tuition (dp/p) is negative and equal to -0.4. This means that as tuition increases, the quantity of higher education demanded decreases, but the extent of the decrease is relatively small.
Therefore, if colleges raised tuition slightly, the decrease in quantity demanded would be offset by the increase in tuition charged, leading to an increase in total tuition receipts. This is the suggested conclusion based on the given result.
Option (A) is incorrect because the negative sign in the elasticity equation implies that as tuition rises, the quantity demanded decreases, not increases. Option (B) is not relevant to the given result since the elasticity equation only considers the relationship between tuition and quantity demanded. Option (C) is not supported by the elasticity equation since it does not take into account the decrease in quantity demanded that would result from a decrease in tuition. Option (E) is not related to the given result either.
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Let Ln denote the left-endpoint sum using n subintervals. Compute the indicated left sum for the given function on the indicated interval. (Round your answer to four decimal places.) L4 for f(x) =-11 on [4, 5]
the left-endpoint sum using four subintervals for the function f(x) = -11 on the interval [4, 5] is -2.75.
To compute the left-endpoint sum using n subintervals, we partition the interval [4, 5] into n equal subintervals of length Δx = (5-4)/n = 1/n. Then, we evaluate the function at the left endpoint of each subinterval and multiply by the width of the subinterval, and finally sum up these values.
For the function f(x) = -11 on [4, 5], we have:
Δx = 1/n
x0 = 4
xi = x0 + iΔx = 4 + i/n, for i = 1, 2, ..., n.
The left endpoint of each subinterval is xi-1, so we have:
L_n = Δx [ f(x0) + f(x1) + ... + f(x_{n-1}) ]
= Δx [ f(4) + f(4 + 1/n) + f(4 + 2/n) + ... + f(4 + (n-1)/n) ]
= (1/n) [ -11 + (-11) + ... + (-11) ] (there are n terms)
= -11/n
To find L4, we plug in n=4 into the formula we just derived:
L4 = -11/4 = -2.75 (rounded to four decimal places)
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For a two-tailed hypothesis test about µ, we can use any of the following approaches excepta. compare the level of significance to the confidence coefficientb. compare the value of the test statistic to the critical valuec. compare the p-value to the value of a
For a two-tailed hypothesis test about μ, we can use any of the following approaches except comparing the level of significance; to the confidence coefficient
To determine if the sample mean is substantially more than or significantly less than the population mean, a two-tailed hypothesis test is used. The area under both tails or sides of a normal distribution is what gives the two-tailed test its name.
Any of the following methods, with the exception of comparing the level of significance to the confidence coefficient, can be used for a two-tailed hypothesis test regarding. To create a confidence interval estimate for the population mean, approach (d) compares the level of significance which is a to the confidence coefficient which is 1- a. This method is employed to estimate the population parameter rather than test a hypothesis.
Complete Question:
For a two-tailed hypothesis test about μ, we can use any of the following approaches EXCEPT compare the _____ to the _____.
a.confidence interval estimate of μ; hypothesized value of μ
b.p-value; value of α
c.value of the test statistic; critical value
d.level of significance; confidence coefficient
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Which of the following is 'not' a geometric sequence?
a. 1, 4, 16, 64, ...
b. 4, 2, 1, (1/2), ...
c. 3, 6, 12, 24, ...
d. 6, 4 (1/2), 3, 1 (1/2), ...
Answer:
d. 6, 4 (1/2), 3, 1 (1/2), ...
Step-by-step explanation:
A geometric sequence is any sequence that is exponentially growing/decaying, so analyze the slopes. The slope for D is a constant -1.5, so it is a linear (not geometric) sequence.
Evaluate. f(x) = 2x - 1, f(2)
Answer:
f(2) = 3
Step-by-step explanation:
Substitute 2 for x, and evaluate the expression.
f(x) = 2x - 1
f(2) = 2(2) - 1
f(2) = 4 - 1
f(2) = 3
I really need help..im confused
EASY GEOMETRY**
what is the measure of the angle shown.
Answer:
C
Step-by-step explanation:
You know it is an acute angle, meaning that it has to be below 90 degrees.
~theLocoCoco
Answer:
Answer would be C
Step-by-step explanation:
Dianna made several loaves of bread yesterday. Each loaf required 2 and two-thirds cups of flour. All together, she used 13 and one-third cups of flour. How many loaves did Dianna make?
3 loaves
4 loaves
5 loaves
7 loaves
Answer:
5
Step-by-step explanation:
Answer:
5
Step-by-step explanation:
correct on eduinity
Which are correct representations of the inequality –3(2x – 5) < 5(2 – x)? Select two options.
The solution range for the given function inequality is x > 25.
What is function?A function is a relation between a dependent and independent variable. Mathematically, we can write -
y = f(x) = ax + b
Given is the function inequality as -
- 3(2x - 5) < 5(2 - x)
The given function inequality is -
- 3(2x - 5) < 5(2 - x)
- 6x - 15 < 10 - 5x
- 6x + 5x < 10 + 15
- x < 25
x > 25
Therefore, the solution range for the given function inequality is x > 25.
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Find the x- and y- intercepts of each line: 4y=10x-24
\(x = \frac{12}{5}\) or the x-intercept coordinates, \((\frac{12}{5},0)\\\).
\(y = -6\) or the y-intercept coordinates, \((0,-4)\).
Solution:Simplifying the equation into standard form:
\(4y = 10x - 24 \\ 4y - 10x = - 24\)
Finding the x-intercept by evaluating (x,0):
\(4(0) - 10x = - 24 \\ - 10x = - 24 \\ x = \frac{ - 24}{ - 10} \\ x = \frac{12}{5} \)
Finding the y-intercept by evaluating (0,y):
\(4y - 10(0) = - 24 \\ 4y = - 24 \\ y = \frac{ - 24}{4} \\ y = - 6\)
a + x = -3 với a = 5 . Tìm x
Answer:
the answer is if a=5
than, 5+x=-3
or,x=-3-5
therefore x=-8
Answer:
\(x = - 8\)
Step-by-step explanation:
\(a + x = - 3\)
\(5 + x = - 3\)
\( x = - 3 - 5\)
\(x = - 8\)
Hope it is helpful...help me please !!!! i’m so bad at this !!
Answer:
Step-by-step explanation:
So you would take like three points from the shape and Multiply it by 1/3 and make the new graph.
I would show you but I dont know what to use for it.
Answer:
So, just divide each side by three
Step-by-step explanation:
.....
I cant draw it for you, but thats how u do it
How do you solve complex fraction equations?
To solve complex fractions there are two methods -
1 - Divide the numerator by the denominator by multiplying the numerator by the reciprocal of the denominator and then simplify further if necessary.
2 - Multiply the numerator and denominator of the overall complex fractions and then simplify further if necessary.
What is a complex fraction?
A rational expression with a fraction in the numerator, denominator, or both is referred to as a complex fraction.
There are two ways to solve a complex fraction -
Method 1 : Take an example - (1/3-1/4)/(1/8+1/2)
Step 1 - If necessary, combine the denominator and numerator into a single fraction.
Add the numerator -
=1/3-1/4
=(4-3)/12
=1/12
Add the denominator -
=1/8+1/2
=(1+4)/8
=5/8
Combine back to form a complex fraction -
=(1/12)/(5/8)
Step 2: Multiply the numerator by the denominator's reciprocal, then divide the result by the denominator.
Step 3: Simplify the rational expression if necessary.
=(1/12)×(8/5)
=8/60
=2/15
Method 2: Take an example - [(2x+1)/(x^2-25)]/[(4x^2-1)/(x-5)]
Step 1 - Divide the LCD of the smaller fractions by the numerator and denominator of the total complex fractions.
(x^2-25)=(x+5)(x-5)
The denominator of the denominator’s fraction has the following factor -
(x-5)
Using the highest exponent and combining all the other factors, we arrive at the LCD shown below for all the little fractions -
(x+5)(x-5)
By multiplying the LCD by the numerator and denominator -
=[{(2x+1)/(x+5)(x-5)}×(x+5)(x-5)]/[{(2x+1)(2x-1)/(x-5)}×(x+5)(x-5)]
=(2x+1)/(2x+1)(2x-1)(x+5)
Step 2 - Simplify the rational expression if necessary.
=(2x+1)/(2x+1)(2x-1)(x+5)
=1/(2x-1)(x+5)
Therefore, there are two methods to solve complex fractions.
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