A middle school principal wants to change the lunch menu at the school. The principal surveys the students to determine how the students would feel about the changes. Which survey method will produce the best representative sample?
A: survey every fifth student who rides in a car to school
B: survey 3 randomly selected students from every homeroom
C: survey every tenth seventh grade student during lunch
D: survey 5 randomly selected students from every art, drama, and music class

Your answer is x = 1

Step-by-step explanation:

First start by distributing 5 to everything in the parenthesis.

5 * 2x = 10x

5 * -8 = -40

What you're left with is 10x - 40 + 15 = -15

Next subtract 15 from both sides.

10x - 40 + 15 - 15

The 15's will cancel each other out on the left side.

-15 - 15 = -30

What you're left with is 10x - 40 = -30

Next add 40 to both sides.

10x - 40 + 40

The 40's will cancel each other out on the left side

-30 + 40 = 10

What you're left with is 10x = 10

Divide both sides by 10 to get x by itself.

10x / 10 = x

10 / 10 = 1

What you're left with is x = 1