Please help its for a test

C.

Step-by-step explanation:

First, recognize the fact that he has a total of 4 boxes, with only 8 different colored crayons inside. Next, you should see that each colored crayon can be found in the box 5 times, or there is 5 of the same crayon. Saying this, you know that the total amount of crayons would be 5 x 8, correct. Okay, so now, you will want to understand that he has 4 boxes, so you will multiply 4 x 40 (from the 5 x 8), which can be seen as 4 x 5 x 8 = c.

Hope this helps! :)

8. a. 7

   b. 7(2x+4y+3)

9. 3(5a-2b+12)

  -3(-5a+2b-12)