The equation is separable, so solving it is trivial:

Integrating both sides gives

Given
and
, we find


so the answer is E.
The answer is 6.89 because
6.89+14.52=21.41
So 21.41+(-14.52)=6.89
B.Number of eye blinks in a minute.
We do not have a set amount of blinks per minute.
A.Inccorect,a touchdown is 6 points
C.Speed of a race car rises at a constant rate depending on the car,speed e.t.c
D.Dogs get placed in a kennel and have a set ammount.
It seems like you have the answer already. but heres how its calculated.
so the missing number is 20 **cross multiply 100 and 3 to get 300 then divide 15 into 300 to get 20**
so the missing number is 50
**cross multiply 100 and 80 to get 8000 then divide 160<span> into 8000 to get 50**</span>
Answer:
Your answer would be A
The site Math-way is a good tool for this