Let the cost of a shirt be s.
Three shirts = 3s.
3s + 15 ≤ 80 (Answer F)
12/x+5
x represents “a number” because it’s unknown and the + sign is because the words sum
7 is the most amount of books that would fit on a 18 inch shelf
.25 or 1/4
How:
2^4=16
2^-6=<span>.015625
16*.015625 = .25</span>
