10q - 20 is equivalent to _____.

Question

2(q - 10)
10(q - 20)
10(q - 2)

Answer 1

Rachel works at a bookstore. On Tuesday, she sold twice as many books as she did on Monday. On Wednesday, she sold 6 fewer books than she did on Tuesday. During the three days, Rachel sold 19 books. Create an equation that can be used to find m, the number of books Rachel sold on Monday.

Answer 2

10q-20 when common factored (which is you bring the biggest number that goes into both pieces out to the front)
= 10(q - 2)
You can do a check to see if your answer is right when you multiply the 10 back into the brackets
check: 10(q) - 2(10)
= 10q - 20

Answer 3

Let m = Mondays book sales
Tuesday was twice as many... 2m
and Wednesday was 6 less (so minus 6) then Tuesday

Sales = Monday + Tuesday + Wednesday
Sales = m + 2m + 2m-6
Sales totalled 19
19 = m + 2m + 2m - 6