Answer:
30
Step-by-step explanation:
80 + 40 = 120
120 represents the total students for all 4 classes. And since there is an even amount in each class...
120 / 4 = 30
So 30 would be your answer.
Answer:
96π
Step-by-step explanation:

V=96π
15% of $7 is $1.05
7 x 74 = 518
1678 + 518 = 2196
She will earn $2196 in those 2 weeks
I believe your answer is 513200000
Hope this helps!