Answer:
15
Step-by-step explanation:
3 ×(8 +2) :2 =
3 ×10 :2 =
30 :2 =
4 people eat the pizza for lunch
18, 19(which has two) 20(has two)
Just find the ones that appear more than one time.
a^5·a^4/a^2
= a^(5 + 4 - 2)
= a^7
Hope that helps