Solve.A boat moves 28 km/h in still water. It travels 80 km upstream and 80 km downstream in a total time of 7 hours. What is the speed of the current?
A. 12 km/h
B. 10 km/h
C. 9 km/h
D. 8 km/h
Answer: A
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Solve the problem.A store owner finds that the demand function for a product he sells is 
, where D(p) is the number of items that can be sold in one day at a price of p dollars. Find the elasticity function for this demand function.
A. E(p) = 
B. E(p) = 
C. E(p) = 
D. E(p) = 
Find the mean for the given sample data. Unless otherwise specified, round your answer to one more decimal place than that used for the observations.The normal monthly precipitation (in inches) for August is listed for 20 different U.S. cities. Find the mean monthly precipitation.
A. 2.80 in. B. 2.94 in. C. 3.09 in. D. 3.27 in.
Assume that the cities lie on the same north-south line and that the radius of the earth is 6400 km. Find the latitude of Spokane, WA if Spokane and Jordan Valley, OR, 
are 
apart.
A. 52.46 °N B. 39.5 °N C. 38.8 °N D. 47.5 °N
Find the surface area of the figure. Use 3.14 as an approximation for ?. Round your result to the nearest tenth.A sphere with r = 5.8 yd
A. 140.8 yd2 B. 422.4 yd2 C. 816.9 yd2 D. 105.6 yd2