The graph of f is shown. Evaluate each integral by interpreting it in terms of areas.

a = 18
b = 36
c = 54
d = 72

(a) f18 f (x)dx = I:1 (b) i45 f (x)dx = 0 (c) i63 f (x)clx = 45 (d) f81 f (x)dx = 0 

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