I'm gonna say A. It makes the most sense to me.
I would don't really have the answer to this question maybe try rewording it
Answer:
Total revenue =
dollars
Step-by-step explanation:

Integrate with respect to
.
∫
dx
Take 
Differentiate with respect to 

So,
∫
Use integration by parts: ∫f g dx = f∫ g dx-∫(∫g dx)f' dx
Therefore,
∫
=
∫
Put 

To find total revenue from the sale of the first 12 calculators, put 

Total revenue =
dollars
Answer:
A
Step-by-step explanation:
B1 represents the slope of the population regression line so A is the answer