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3 years ago

Solve for x "9x^2-x=0"

Mathematics

1 answer:

Anestetic [448]3 years ago

4 0

$9x^2-x=0\\
x(9x-1)=0\\
x=0 \vee x=\dfrac{1}{9}$

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I need help with this question ASAP some plz help me

madam [21]

cube root on both sides then subtract 7

answer would be (cube rooted)A-7=Z if that makes sense

4 0

3 years ago

Read 2 more answers

An airplane flew for 4 hours at a speed of a miles per hour (mph), and at (x + 10) mph for next 4 hours. What expression can be

Akimi4 [234]

Answer:

I think it would be C in my cass

Step-by-step explanation:

5 0

2 years ago

Darren wants to estimate the mean age in a population of trees. He'll sample nnn trees and build a 90\%90%90, percent confidence

Alchen [17]

Using the z-distribution, as we have the standard deviation for the population, it is found that the smallest sample size required to obtain the desired margin of error is of 77.

<h3>What is a z-distribution confidence interval?</h3>

The confidence interval is:

$\overline{x} \pm z\frac{\sigma}{\sqrt{n}}$

In which:

$\overline{x}$ is the sample mean.

z is the critical value.

n is the sample size.

$\sigma$ is the standard deviation for the population.

The margin of error is given by:

$M = z\frac{\sigma}{\sqrt{n}}$

In this problem, we have that the parameters are given as follows:

$M = 3, z = 1.645, \sigma = 16$ .

Hence, solving for n, we find the sample size.

$M = z\frac{\sigma}{\sqrt{n}}$

$3 = 1.645\frac{16}{\sqrt{n}}$

$3\sqrt{n} = 1.645 \times 16$

$\sqrt{n} = \frac{1.645 \times 16}{3}$

$(\sqrt{n})^2 = \left(\frac{1.645 \times 16}{3}\right)^2$

$n = 76.97$

Rounding up, the smallest sample size required to obtain the desired margin of error is of 77.

More can be learned about the z-distribution at brainly.com/question/25890103

4 0

1 year ago

Which expression is equivalent to -x4x4x4x4x4x4x4x4?

Zanzabum

An expression equivalent to that given would be 4^8 or also written as four to the eighth power, hope this helped! Please rate my answers.

Work: 4^8 = 4x4x4x4x4x4x4x4

7 0

3 years ago

Simplify 3/4 - 4 z + 5/4 z - 1/2 + 1/2 z enter your answer in the box.

creativ13 [48]

3/4 - 4 z + 5/4 z - 1/2 + 1/2 z

First, put the like terms together:

-4z + 5/4z + 1/2z + 3/4 - 1/2

Find the LCM of the first three to turn them into one massive fraction:

-16/4z + 5/4z + 2/4z + 3/4 - 1/2

Do the same for the last 2 fractions:

-16/4z + 5/4z + 2/4z + 3/4 - 2/4

Simplify everything (keeping like terms in mind)

-9/4z + 1/4

And that's the answer :)

(I think)

3 0

3 years ago