The driveway of the Santiagos' new home is to be bounded by semicircle arcs as shown. The distance from X to Y is 100 ft. The concrete driveway is 10 ft wide and 1/3 fit thick. Using 3.14 as an approximation for pi, how many cubic feet of concrete are needed to build the driveway? (Round your answer to the nearest cubic foot.) A. 471 ft^3
B. 942 ft^3
C. 1060ft^3
D. 1308 ft^3
E. 1884 ft^3

What is the approximate circumference of the circle shown below?

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Quick! a survey of 57 customers was taken at a bookstore regarding the types of books purchased. the survey found that 33 customers purchased mysteries, 25 purchased science fiction, 18 purchased romance novels, 12 purchased mysteries and science fiction, 9 purchased mysteries and romance novels, 6 purchased science fiction and romance novels, and 2 purchased all three types of books. a) how many of the customers surveyed purchased only mysteries? b) how many purchased mysteries and science fiction, but not romance novels? c) how many purchased mysteries or science fiction? d) how many purchased mysteries or science fiction, but not romance novels? e) how many purchased exactly two types of books?