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3 years ago

Please help its math

Mathematics

1 answer:

Len [333]3 years ago

7 0

Answer:

Step-by-step explanation:

3 divided by one third is 1. Then you do one plus one which is two. Then you do 9 minus 2, which is 7.

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Simplify and divide the following radical expression: √15/ 3√6

denis-greek [22]

Answer:

Math way

Step-by-step explanation:

use this to help u

7 0

3 years ago

Find the equation of a parabola that opens up and has the following x intercepts (-3,0) and (4,0)

Elenna [48]

The equation of a parabola that opens up and has the following x intercepts (-3,0) and (4,0) is $y=x^{2}-x-12$

<h3><u>Solution:</u></h3>

We have to find the equation of a parabola that opens up and has the following x intercepts (-3, 0) and (4, 0)

x-intercepts of the parabola are (−3, 0) and (4, 0)

So, we can form an equation:

Also x = 4

x – 4 = 0

x – 4 = 0 is another factor of quadratic equation.

The quadratic function is:

$\begin{array}{l}{y=(x+3)(x-4)} \\\\ {y=x^{2}-4 x+3 x-12} \\\\ {y=x^{2}-x-12}\end{array}$

Hence, the equation of the parabola is $y=x^{2}-x-12$

5 0

3 years ago

On last week math tests Mr.Jones class had an average of 82 points with a standard deviation of 10 points.Mrs.Potters class had

katrin [286]

Mrs. Potter’s class was more consistent because their standard deviation of 3 points was lower.

<h3>What is a statistical dispersion?</h3>

A statistical dispersion is also referred to as degree of dispersion and it can be defined as a measure of the extent to which a numerical value (data) is likely to vary about a mean or an average value.

In Mathematics, there are four measures of dispersion for a data set and these include the following:

Range

Interquartile range

Variance

Standard deviation

In this scenario, we can infer and logically conclude that Mrs. Potter’s class was more consistent than Mr. Jones class because their standard deviation of 3 points was lower.

Read more on standard deviation here: brainly.com/question/24298037

#SPJ1

8 0

2 years ago

HELP WILL GIVE BRAINLIEST

CaHeK987 [17]

Answer:

I = 575.0, .08, 3.0

I= 138, i think

Step-by-step explanation:

4 0

3 years ago

Consider a drug testing company that provides a test for marijuana usage. Among 317 tested subjects, results from 25 subjects w

Neko [114]

Answer:

The null and alternative hypothesis are:

$H_0: \pi=0.1\\\\H_a:\pi$

The test statistic for this hypothesis test is z=-1.15.

The P-value for this hypothesis test is P-value=0.124.

The null hypothesis failed to be rejected.

There is not enough evidence to support the claim that less than 10 percent of the test results are wrong.

Step-by-step explanation:

This is a hypothesis test for a proportion.

The claim is that less than 10 percent of the test results are wrong.

Then, the null and alternative hypothesis are:

$H_0: \pi=0.1\\\\H_a:\pi$

The significance level is 0.05.

The sample has a size n=317.

The sample proportion is p=0.079.

$p=X/n=25/317=0.079$

The standard error of the proportion is:

$\sigma_p=\sqrt{\dfrac{\pi(1-\pi)}{n}}=\sqrt{\dfrac{0.1*0.9}{317}}\\\\\\ \sigma_p=\sqrt{0.000284}=0.017$

Then, we can calculate the z-statistic as:

$z=\dfrac{p-\pi+0.5/n}{\sigma_p}=\dfrac{0.079-0.1+0.5/317}{0.017}=\dfrac{-0.019}{0.017}=-1.153$

This test is a left-tailed test, so the P-value for this test is calculated as:

$P-value=P(z$

As the P-value (0.124) is greater than the significance level (0.05), the effect is not significant.

The null hypothesis failed to be rejected.

There is not enough evidence to support the claim that less than 10 percent of the test results are wrong.

4 0

3 years ago