64*3= 192 I multiplied that because the car traveled for 3 hours at the speed of 64 miles.
64-15= 49 I subtracted 15 out of 64 because the car only traveled 45 minutes after the three hours.
=241 final answer
Positive I think that would be it
The equation of a circle:

(h,k) - the coordinates of the center
r - the radius
The center is (4,0), the length of the radius is 2√3.
I=400(0.04)(5)
Interest is 80 dollars of interest
400+80=480
I think that is the answer you're looking for :)