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3 years ago

1 subscription for $21, 28 subscriptions for x dollars help please

Mathematics

2 answers:

Black_prince [1.1K]3 years ago

7 0

Answer:

Just do 28*21 which is 588$

Step-by-step explanation:

PLEASE MARK BRAINLIEST

zepelin [54]3 years ago

5 0

Answer:

please mark other person brainliest

Step-by-step explanation:

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Please help :) it's not to hard

Degger [83]

Answer:

Step-by-step explanation:

4 0

3 years ago

The sum of the digits of a certain two-digit number is 11. When you reverse its digits you increase by 9. What is the number?

jarptica [38.1K]

The number is composed by two digits, let them be ab, so we have:
a + b = 11

this is a pseudo-equation, we are not multiplying ab or ba, is just the digits order.
ba = ab + 9
The pairs of numbers that could comply with the first equation are:
(2,9)
(3,8)
(4,7)
(5,6)
But only the last couple (5,6) comply as well with the second condition. Because 65 = 56 + 9
Therefore the unknown number is 56

8 0

4 years ago

A publisher reports that 75% of their readers own a particular make of car. A marketing executive wants to test the claim that t

Korolek [52]

Answer:

The p-value of the test is of 0.0536 > 0.02, which means that there is not sufficient evidence at the 0.02 level to support the executive's claim.

Step-by-step explanation:

A publisher reports that 75% of their readers own a particular make of car. A marketing executive wants to test the claim that the percentage is actually different from the reported percentage.

At the null hypothesis, we test if the proportion is of 75%, that is:

$H_0: p = 0.75$

At the alternate hypothesis, we test if the proportion is different of 75%, that is:

$H_1: p \neq 0.75$

The test statistic is:

$z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

In which X is the sample mean, $\mu$ is the value tested at the null hypothesis, $\sigma$ is the standard deviation and n is the size of the sample.

75% is tested at the null hypothesis:

This means that $\mu = 0.75, \sigma = \sqrt{0.75*0.25}$

A random sample of 280 found that 70% of the readers owned a particular make of car.

This means that $n = 280, X = 0.7$

Value of the test statistic:

$z = \frac{X - \mu}{\frac{\sigma}{\sqrt{n}}}$

$z = \frac{0.7 - 0.75}{\frac{\sqrt{0.75*0.25}}{\sqrt{280}}}$

$z = -1.93$

P-value of the test and decision:

The p-value of the test is the probability of finding a sample proportion differing from 0.75 by at least |0.7 - 0.75| = 0.05, which is P(|z| > 1.93), which is 2 multiplied by the p-value of z = -1.93.

Looking at the z-table, z = -1.93 has a p-value of 0.0268.

2*0.0268 = 0.0536.

The p-value of the test is of 0.0536 > 0.02, which means that there is not sufficient evidence at the 0.02 level to support the executive's claim.

5 0

3 years ago

Please help! Find the indicated real n-th roots of x, if any. Give your answer in simplest form.

pishuonlain [190]

1. $\sqrt[6]{64}$

    $2$

2. $\sqrt[3]{128}$

    $1.014096553300555$

3. $\sqrt[10]{1024}$

    $1.01181879913814$

6 0

3 years ago

3 divide by what number equals 5

marysya [2.9K]

First write the equation
3/n = 5

Multiply both sides by n
3/n * n = 5 * n

Simplify
3 = 5 * n

Divide both sides by 5
3/5 = 5 * n/5

Simplify
3/5 = n

Divide
0.6 = n

So 3/0.6 = 5

4 0

4 years ago