C. 200
They earn $2.50 per box of markers, meaning that to make $500 they have to sell 200. [500/2.5=200]
Answer:
?
.
Step-by-step explanation:
Answer:
Option D, 
Step-by-step explanation:
<u>Step 1: Determine the rate of change or slope</u>




Answer: Option D, 
I believe the answer is 1 because the line is negative and has a slope of 1/2 so -1/2 and it crosses at 8