Approximate the definite integral
\int_{4}^{7} |6 - t|\, dt
using midpoint Riemann sums with the following partitions:

(a)P = \lbrace 4, 6, 7 \rbrace . Then midpoint Riemann sum =

(a)

(b) Using 3 subintervals of equal length. Then midpoint Riemann sum =

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