I think the answer is 500 dollars but idk don't quote me sorry if you get it wrong.
Answer:
The volume of the dirt in the flowerbed is 
Step-by-step explanation:
we know that
To find the volume of the dirt in the flowerbed, multiply the long by the width by the depth
so

A, it's always positive because B(0) = 400
C, the population is growing. you can tell because the base is the rate of growth 1.4 > 1
It would be the letter A.
I hope this helps! <3