Solve the problem.Mike, Joe, and Bill are painting a fence. The painting can be finished if Mike and Joe work together for 4 hours and Bill works alone for 2 hours or if Mike and Joe work together for 2 hours and Bill works alone for 5 hours, or if Mike works alone for 6 hours, Joe works alone for 2 hours, and Bill works alone for 1 hour. How much time does it take for each man working alone to complete the painting?
A. Mike 12 hr, Joe 10 hr, Bill 10 hr
B. Mike 16 hr, Joe 8 hr, Bill 8 hr
C. Mike 8 hr, Joe 8 hr, Bill 16 hr
D. Mike 8 hr, Joe 16 hr, Bill 8 hr
Answer: D
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The following question refers to a country with five states. There are 250 seats in the legislature, and the populations of the states are given in the table below.
Under Webster's method, the apportionments to each state are
A. State A: 6; State B: 22; State C: 118; State D: 96; State E: 8. B. State A: 7; State B: 22; State C: 117; State D: 95; State E: 9. C. State A: 6; State B: 22; State C: 117; State D: 96; State E: 9. D. State A: 6; State B: 23; State C: 116; State D: 96; State E: 9. E. none of these
Use an inverse matrix to find the solution to the system.
A. x = 5, y = -2, z = -7 B. x = 6, y = 0, z = 7 C. x = 5, y = 2, z = 7 D. x = 2, y = 7, z = 2
Solve the problem.A company manufactures three products. The graph shows the production from 1986 to 1996. In what year did the production of A equal the production of B?
A. 1991 B. 1996 C. 600,000 D. 650,000
Find the radian measure of the angle ?.The length of the circular arc associated with ? is 21 on a circle of radius 
.
A. 
B. 21
C. 63
D. 28