All categories

3 years ago

2(x+3)=x-4 solving equations

Mathematics

2 answers:

Harlamova29_29 [7]3 years ago

6 0

Answer:

x= -10

Step-by-step explanation:

2(x+3) = x-4

Distribute to simplify left side, 2x+6= x-4
-x both sides, x+6= -4
subtract 6 both sides, x=-10

Harrizon [31]3 years ago

4 0

Answer:

X=-10 most likely

Step-by-step explanation:

2x+6=x-4

2x-x=-6-4

X=-10

You might be interested in

52/30 simplified to lowest point

kumpel [21]

26/ 15 but make it into a mixed number you can do it!

8 0

3 years ago

K/a = w - v, solve for a

erik [133]

Answer:

a=k-w+v

Step-by-step explanation:

k/a= w-v

a( k/a) = a (w-v)

k -w + v =a

4 0

3 years ago

Scores on the math portion of the SAT are believed to be normally distributed and range from 200 to 800. A researcher from the a

Doss [256]

Using the z-distribution, it is found that she should take a sample of 46 students.

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

The confidence interval is:

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

The margin of error is:

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

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.

In this problem, we have a 95% confidence level, hence $\alpha = 0.95$ , z is the value of Z that has a p-value of $\frac{1+0.95}{2} = 0.975$ , so the critical value is z = 1.96.

Scores on the math portion of the SAT are believed to be normally distributed and range from 200 to 800, hence, by the Empirical Rule the standard deviation is found as follows:

$6\sigma = 800 - 200$