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3 years ago

15

What is the product? (4x)(-3x^8) (-7x^3) -84x1 12 -84x24 O 84x12 84724

1 answer:

My name is Ann [436]3 years ago

6 0

Answer:

84x^12

Step-by-step explanation:

4x* -3x^8= -12x^9

-12x^9*-7x63= 84x^(9+3)

=84x^12

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Question 3 A study was performed to determine whether men and women differ in their repeatability in assembling components on pr

Fed [463]

Answer:

There is no sufficient evidence to support the claim that men and women differ in repeatability for this assembly task

Step-by-step explanation:

Given

Let subscript 1 represent men and 2 represent women, respectively.

$n_1 = 25$

$n_2 = 21$

$s_1 = 0.98$

$s_2 = 1.02$

$\alpha = 0.02$

Required

Determine if here is enough evidence

First, we need to state the hypotheses

$H_o: \sigma_1^2 = \sigma_2^2$

$H_1: \sigma_1^2 \ne \sigma_2^2$

Next, calculate the test statistic using:

$F = \frac{s_1^2}{s_2^2}$

$F = \frac{0.98^2}{1.02^2}$

$F = 0.923$

Calculate the rejection region;

But first, calculate the degrees of freedom

$df_1 =n_1 - 1$

$df_1 =25 - 1$

$df_1 =24$

$df_2 = n_2 -1$

$df_2 = 21 - 1$

$df_2 = 20$

Using the F Distribution: table

$c = \frac{\alpha}{2}$

$c = \frac{0.02}{2}$

$c = 0.01$

At 0.01 level (check row 20 and column 24), the critical value is:

<em></em> $f_{0.01,24,20} = 2.86$ <em> --- the upper bound</em>

At 0.01 level (check row 24 and column 20), the critical value is:

$f_{0.01,20,24} = 2.74$

Calculate the inverse F distribution.

$f_{0.99,20,24} = \frac{1}{f_{0.01,20,24}} = \frac{1}{2.74} =0.365$ ---- the lower bound

The rejection region is then represented as:

$0.365 < Test\ Statistic < 2.86$

If the test statistic falls within this region, then the null hypothesis is rejected

$F = 0.923$ --- Test Statistic

$0.365 < 0.923 < 2.86$

<em>The above inequality is true; so, the null hypothesis is rejected.</em>

<em>This implies that, there is no sufficient evidence.</em>

7 0

3 years ago

Please help, I really need help

7nadin3 [17]

So the teacher bought 1/4 of the brownie pan. And it came out to $4.
I hope this helps! :)

5 0

3 years ago

Ashlyn has three more than twice the number of pencils that Yasmin has. Ashlyn has 21 pencils. This can be represented by the eq

cricket20 [7]

Answer:
The variable n represents the number of pencils that Yasmin has.

You can solve for n to determine how many pencils Yasmin has.

7 0

3 years ago

Oxford currently generates 45,000 tons of garbage per year. but the city is launching some recycling initiatives to bring that n

barxatty [35]

Answer:

-Exponential Decay

-Decay factor is (1-0.05)

Step-by-step explanation:

-Given that the number decreases by a defined rate each year from the initial size by 5%,

-This is an exponential decay function of the form:

$y=Ae^{-rt}$

Where:

$y$ is the quantity/size after time t

$A$ is the initial size

$r$ is the rate of decay

-Our function can the be written as

$y=45000e^{-0.05t}$

Hence, the decay rate/factor is 0.05

#Alternatively

The exponential decay can be of the form:

$y=ab^x$

Where:

y is the size at time x, a is the initial size, x is time and b is the decay factor.

b is of the form $b=(1-r),\ \ r=decay\ rate$

$y=ab^x\\\\y=45000(1-0.05)^x$

Hence, the decay factor is (1-0.05)

8 0

3 years ago

Write the equation of this line in Point-Slope Form.

Leona [35]

Answer:

y -3 = (-1/2)(x - 5)

Step-by-step explanation:

Slope of line: Notice that if we go from 7 to 5, the 'run' is -2 and the corresponding 'rise' from 2 to 3 is 1. Thus, the slope is m = -1/2.

Using m = -1/2 and the point (5, 3), we write the equation of this line in point-slope form as:

y -3 = (-1/2)(x - 5)

5 0

3 years ago