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4 years ago

Can you help ASAP!!

Mathematics

1 answer:

Anna35 [415]4 years ago

8 0

Answer:

It should be written as 8x-15x

Step-by-step explanation:

If you have any questions about the way I solved it, ask in the comments

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Find the map ratio if 10 cm on the map is represented by 10 km

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I think this is the answer :)

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What is the domain of the relation {(-10, 2), (0,2), (10,0), (10,2)?

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The answer is c. because the domain is the first number of each set of points

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How to find the endpoint when given the midpoint and one of the end points

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3 years ago

Suppose a consumer group suspects that the proportion of households that have three cell phones NOT known to be 30%. A cell phon

leva [86]

Answer:

We conclude that the actual percentage of households is equal to 30%.

Step-by-step explanation:

We are given that a consumer group suspects that the proportion of households that have three cell phones NOT known to be 30%.

Their marketing people survey 150 households with the result that 43 of the households have three cell phones.

Let p = proportion of households that have three cell phones NOT known.

So, Null Hypothesis, $H_0$ : p = 30% {means that the actual percentage of households is equal to 30%}

Alternate Hypothesis, $H_A$ : p $\neq$ 30% {means that the actual percentage of households different from 30%}

The test statistics that would be used here One-sample z-test for proportions;

T.S. = $\frac{\hat p-p}{\sqrt{\frac{p(1-p)}{n} } }$ ~ N(0,1)

where, $\hat p$ = sample proportion of households having three cell phones = $\frac{43}{150}$ = 0.29

n = sample of households = 150

So, the test statistics = $\frac{0.29-0.30}{\sqrt{\frac{0.30(1-0.30)}{150} } }$

= -0.27

The value of z test statistic is -0.27.

Also, P-value of the test statistics is given by;

P-value = P(Z < -0.27) = 1 - P(Z $\leq$ 0.27)

= 1 - 0.6064 = 0.3936

Now, at 1% significance level the z table gives critical value of -2.58 and 2.58 for two-tailed test.

Since our test statistic lies within the range of critical values of z, so we have insufficient evidence to reject our null hypothesis as it will not fall in the rejection region due to which we fail to reject our null hypothesis.

Therefore, we conclude that the actual percentage of households is equal to 30%.

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3 years ago

After substituting, what is the first operation performed when evaluating 5 + (9 x minus 3) divide 2 for x = 5? addition multipl

ludmilkaskok [199]

Answer:

<h2>Multiplication.</h2>

Step-by-step explanation:

The given expression is

$5+(9x-3) \div 2$

For $x=5$ , we have

$5+(9(5)-3) \div 2$

Notice that the first operation we need to do is multiplication, because that's the right order of operations when we solve these kind of expressions.

$5+(45-3) \div 2$

Then, we subtract

$5+42 \div 2$

Now, we divide

$5+21$

Finally, we sum

$26$

Therefore, the right answer is multiplication.

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