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3 years ago

The sum of two times a number and five is eight

2 answers:

7 0

The answer is 1.5

To solve a question like this, you need to put X on one side of the equation and the the numbers on the opposite side.

2x + 5 = 8

To solve for X...
1. subtract 5 from both sides to get 2x = 3
2. divide both sides by 2 to get X by itself
3. x = 1.5

Hope this helps!

In-s [12.5K]3 years ago

4 0

2(x+5)=8

2x+10=8

2x=-2

x=-1

(Read this wrongly, my apologies.)

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In a recent study of 42 eighth graders, the mean number of hours per week that they watched television was 19.6. Assume the popu

olya-2409 [2.1K]

Answer:

$19.6-2.42\frac{5.8}{\sqrt{42}}=17.43$

$19.6+2.42\frac{5.8}{\sqrt{42}}=21.77$

And the best option for this case would be:

a. (17.5, 21.7)

Step-by-step explanation:

Information given

$\bar X= 19.6$ represent the sample mean

$\mu$ population mean

$\sigma= 5.8$ represent the population deviation

n=42 represent the sample size

Confidence interval

The confidence interval for the mean is given by the following formula:

$\bar X \pm t_{\alpha/2}\frac{s}{\sqrt{n}}$ (1)

The degrees of freedom, given by:

$df=n-1=42-1=41$

Since the Confidence is 0.98 or 98%, the significance would be $\alpha=0.02$ and $\alpha/2 =0.1$ , and the critical value would be $t_{\alpha/2}=2.42$

Replacing we got:

$19.6-2.42\frac{5.8}{\sqrt{42}}=17.43$

$19.6+2.42\frac{5.8}{\sqrt{42}}=21.77$

And the best option for this case would be:

a. (17.5, 21.7)

8 0

3 years ago

Can someone pls help me

skelet666 [1.2K]

The midpoint is

(-4+0) / 2, (7 + (-3))/ 2 The first one is x coordinate and 2nd is the y cood)

= (-2, 2) answer

6 0

4 years ago

Write an expression using exponents that is equivalent to 100,000

MrMuchimi

10^5 is equivalent to 100,000. I hope this answers your question and I hope you have a great day ! :)

6 0

2 years ago

PLEASE HELP <br> WILL GIVE BRAINLIEST AND 5.0 RATING

sattari [20]

Answer:

5.4

Step-by-step explanation:

8 0

3 years ago

Read 2 more answers

Due to the economy and not wanting to eliminate any jobs, all state employees were asked to accept a 4.5% reduction in their sal

jeka94

Answer: The secretary's salary prior to the reduction was $42,000.

Step-by-step explanation:

Hi, to answer this question we have to write an equation:

The original secretary's salary (x) multiplied by the percentage reduction in decimal form (4.5/100) must be equal to the amount of the reduction (1890)

Mathematically speaking:

x (4.5/100)= 1890

Solving for x:

x (0.045)= 1890

x = 1890/ 0.045

x = 42,000

The secretary's salary prior to the reduction was $42,000.

7 0

3 years ago