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Unformatted text preview: (x)dx for the graph of y = f (x) below, where f (x) consists of line segments and circular
0 The value of 7 f (x)dx is
0 (A) less than 7.8 (B) between 7.8 and 8.0 (D) between 8.2 and 8.4 (C) between 8.0 and 8.2 (E) more than 8.4 18. Find the exact value of the integral using formulas from geometry.
36 − x2 dx
0 (A) 36π (B) 9π (C) 18π (D) 6π (E) None of these 19. The graph below shows a city’s daily rate of use of electricity (in millions of kilowatts). Estimate the
total daily usage of electricity by summing the area of rectangles. Use the left endpoints, then the
right endpoints, then give the average of those results as the answer. Let the width of each rectangle
be 2 hours. The estimate of the city’s total daily usage of electricity for the given day, found by averaging the
estimates using left and right endpoints, is:
(A) less than 50 million kw-hrs
(B) between 50 million kw-hrs and 100 million kw-hrs
(C) between 100 million kw-hrs and 150 million kw-hrs
(D) between 150 million kw-hrs and 200 million kw-hrs
(E) more than 200 million kw-hrs 20. Find the total area of the shaded region...
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