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4 years ago

Given f(x)= -4x+7, find f(1)

2 answers:

5 0

You replace x with 1, so this looks like:
-4(1) + 7
-4 * 1 also equals -4, so, -4(1) + 7 = -4 + 7. -4 is the slope (down 4 to the left 1), and 7 is the y-intercept, so there should be a point on 7 on the up and down line which is y.

Lisa [10]4 years ago

3 0

Hi there!

To find f(1), plug in x=1 into the equation
f(1) = -4(1) + 7
= -4 + 7
= 3
That's your answer.
Have an awesome day! :)

From your friendly Helper-in-Training, collinjun0827

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It is thought that the front cover and the nature of the first question on mail surveys influence the response rate. An article

denis-greek [22]

Answer:

The null and alternative hypothesis are:

$H_0: \pi_1=\pi_2\\\\H_a:\pi_1\neq \pi_2$

Test statistic z = -0.29

P-value = 0.7709

Fail to reject H0. The data does not suggest that the front cover and nature of the first question on mail surveys influence the response rate.

Step-by-step explanation:

This is a hypothesis test for the difference between proportions.

The claim is that the return rate is different for the Plain cover and the Skydiver cover.

Then, the null and alternative hypothesis are:

$H_0: \pi_1-\pi_2=0\\\\H_a:\pi_1-\pi_2\neq 0$

The significance level is 0.1.

The sample 1 (plain cover), of size n1=209 has a proportion of p1=0.493.

$p_1=X_1/n_1=103/209=0.493$

The sample 2 (skydiver cover), of size n2=215 has a proportion of p2=0.507.

$p_2=X_2/n_2=109/215=0.507$

The difference between proportions is (p1-p2)=-0.014.

$p_d=p_1-p_2=0.493-0.507=-0.014$

The pooled proportion, needed to calculate the standard error, is:

$p=\dfrac{X_1+X_2}{n_1+n_2}=\dfrac{103+109}{209+215}=\dfrac{212}{424}=0.5$

The estimated standard error of the difference between means is computed using the formula:

$s_{p1-p2}=\sqrt{\dfrac{p(1-p)}{n_1}+\dfrac{p(1-p)}{n_2}}=\sqrt{\dfrac{0.5*0.5}{209}+\dfrac{0.5*0.5}{215}}\\\\\\s_{p1-p2}=\sqrt{0.001196+0.001163}=\sqrt{0.002359}=0.049$

Then, we can calculate the z-statistic as:

$z=\dfrac{p_d-(\pi_1-\pi_2)}{s_{p1-p2}}=\dfrac{-0.014-0}{0.049}=\dfrac{-0.014}{0.049}=-0.29$

This test is a two-tailed test, so the P-value for this test is calculated as (using a z-table):

$\text{P-value}=2\cdot P(z$

As the P-value (0.771) is bigger than the significance level (0.1), the effect is not significant.

The null hypothesis failed to be rejected.

There is not enough evidence to support the claim that the return rate is different for the Plain cover and the Skydiver cover.

8 0

3 years ago

FILL IN THE BLANK TO MAKE THE NUMBER SENTENCE TRUE.<br><br> 6 X 2/<br> = 6

mel-nik [20]

6 x 2/2 = 6, because 2/2 is 1 and 6x1 is 6

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3 years ago

Kristin watches 3 television shows every day. She has already watched 15 shows so far. How many days will it take her to watch a

kap26 [50]

45-15= 30

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3 years ago

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Rashid [163]

Step-by-step explanation:

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If my answer helped, please mark me as brainliest,

Thank you !

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4 years ago

Solve the system of linear equations by substitution.

Darya [45]

-X-8+8=-y+8
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8 0

3 years ago

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