Solve the problem.Bengisu was pregnant 273 days and 264 days for her first two pregnancies. In order for Bengisu's average pregnancy to equal a national average of 267 days, how long must her third pregnancy last?
A. 268 days
B. 242 days
C. 264 days
D. 269 days
Answer: C
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Solve the problem.A 20-kg mass is attached to a spring that hangs vertically and is stretched 3 m from the equilibrium position of the spring. Assume a linear spring with F(x) = kx. How much work is required to compress the spring and lift the mass 1.5 m? Round to four decimal places when appropriate.
A. 24.5 J B. 318.5 J C. 220.5 J D. 514.5 J
Evaluate the integral.
A. - 
B. 
C. - 
D. 
Solve the problem.How many five-digit numbers can be formed using the digits 0, 1, 2, 3, 4, 5, 6, if repetitions are not allowed?
A. 2520 B. 16,807 C. 120 D. 119
Find the area of the circle with the given radius or diameter. Use ? ? 3.14.d = 20 cm (Round your answer to the nearest tenth if necessary.)
A. A ? 62.8 cm2 B. A ? 1256 cm2 C. A ? 125.6 cm2 D. A ? 314 cm2