Answer:
A
Step-by-step explanation:
I'm not going to give an explanation but for next time, the stem is the tens place and the leaf is the ones place.
After the 15% discount, Maria pays 85% of the cost. That cost is the sum of the fixed cost and the variable (per visit) cost.
... (updated cost) = 0.85×($150 +$30×a)
... (updated cost) = 127.50 +25.50a . . . . in dollars
Fifth grade has 24 students per each teacher.
Sixth grade has about 23 students per teacher.
Sixth grade is lower.
You just have to multiply 2 by 99, so the answer is 198.