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Answer:
29
Step-by-step explanation:
Our 3 intervals will be from right to left:
(2,3) (1,2) (0,1)
So:
Three rectangles:
f(3)(3-2) + f(2)(2-1) + f(1)(1-0)
= 16(1) + 9(1) + 4(1)
= 29