1. Measurements of a lake’s width were taken at 5-foot intervals, as shown:
x | 0 | 5 | 10 | 15 | 20 | 25 | 30 |
f(x) | 1 | 3 | 4 | 5 | 4 | 6 | 8 |
Estimate 
with n = 3, using each of the following methods.
a. Left-hand approximation
b. Right-hand approximation
c. Trapezoidal approximation
d. Midpoint approximation
e. The Riemann Sum
