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Lapatulllka [165]

3 years ago

9

Select all equations that can result from adding these two equations or subtracting one from the other. x+y=12 3x-5y=4 PLZ HELP

QUICK THE TIME IS ALMOST DONE!

1 answer:

lana [24]3 years ago

8 0

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ext year, my age will be 125% more than it was when I got married. I got married when I was 24. How old will I be next year?

OLEGan [10]

Answer:

54

Step-by-step explanation:

you could either add 125% and 24 to get 54

or you can figure out that 125% of 24 is 30 and add 24 and 30 together to get 54

4 0

3 years ago

Twice a number increased by seven is equal to five. Which of the following represents the equation and solution for this stateme

Aloiza [94]

Answer:

that is the solution is to the question

6 0

4 years ago

She has 7 initiatives and wants to put 2 stickers on each. She has 10 stickers. How many more stickers does she need?

Zina [86]

Answer:

4

Step-by-step explanation:

If she wants to put 2 on each invitation, then we multiply the amount of invitations she has by the amount of stickers going on each invitation. 7 times 2 is 14.

She has 10 stickers, and she needs 14 in total, so we subtract 10 from 14 and we get 4.

In conclusion, the girl needs 4 sticks more

8 0

3 years ago

How many solutions does this equation have?<br><br> u = -6 + 2u

Lapatulllka [165]

Answer:

No Solution because The Line Is Undefined

Step-by-step explanation:

When graphed You Get An Undefined line meaning The Line Is Straight,Horizontal

3 0

3 years ago

According to Nielsen Media Research. of all the U.S. households that owned at least one television set, 83% had two or more sets

Rudik [331]

Answer:

The proportion of U.S. households that owned two or more televisions is 83%.

Step-by-step explanation:

To determine whether the proportions of U.S. households that owned two or more televisions is less than 83% or not let us perform a hypothesis test for single proportion.

<u>Assumptions:</u>

The sample size (<em>n</em>) selected by the local cable company is 300 which is quite large. Then according to the Central limit theorem the sampling distribution of sample proportion follows a normal distribution with mean <em>p</em> and standard deviation $\sqrt{\frac{p(1-p)}{n} }$ .

Since the sampling distribution of sample proportions follows a normal distribution use the <em>z</em>-test for one proportion to perform the test.

<u>The hypothesis is:</u>

$H_{0}$ : The proportion of U.S. households that owned two or more televisions is 83%, i.e. $p=0.83$

$H_{1}$ :The proportion of U.S. households that owned two or more televisions is less than 83%, i.e. $p< 0.83$

<u>Decision Rule:</u>

At the level of significance α = 0.05 the critical region for a one-tailed <em>z</em>-test is:

$\\ Z\leq -1.645\\$

**Use the <em>z</em> table for the critical values.

So, if $\\ Z\leq -1.645\\$ the null hypothesis will be rejected.

<u>Test statistic value:</u>

$z=\frac{\hat{p}-p}{\sqrt{\frac{p(1-p)}{n}}}$

Here $\hat{p}$ is the sample proportion.

Compute the value of $\hat{p}$ as follows:

$\hat{p}=\frac{X}{n} \\=\frac{240}{300}\\ =0.80$

Now compute the value of the test statistic as follows:

$z=\frac{\hat{p}-p}{\sqrt{\frac{p(1-p)}{n}}}\\=\frac{0.80-0.83}{\sqrt{\frac{0.83*(1-0.83)}{300} } } \\=-1.383$

The test statistic is -1.383 which is more than -1.645.

Thus, the test statistic lies in the acceptance region.

Hence we fail to reject the null hypothesis.

<u>Conclusion:</u>

At 0.05 level of significance we fail to reject the null hypothesis stating that the proportion of U.S. households that owned two or more televisions is 83%.

6 0

3 years ago