Please help with explanation!

(A) Estimate the area under the graph of f(x) = 25 - x2 from a = 0 to x = 5 using 5 approximationg rectangles and right endpoints. Estimate = (B) Repeat part (A) using left endpoints. Estimate = (C) Repeat part (A) using midpoints. Estimate =Speedometer readings for a motorcycle at 12-seconds intervals are given in the table. t (sec) 0 12 24 36 48 60 v (ft/sec) 25 30 20 21 26 30 (a) Estimate the distance, in feet, traveled by the motorcycle during the time interval from 0 to 60 seconds using the velocities at the beginning of the time intervals. (b) Give another estimate using the velocities at the end of the time periods