Solve the problem.A man rode a bicycle for 12 miles and then hiked an additional 8 miles. The total time for the trip was 
If his rate when he was riding a bicycle was 10 miles per hour faster than his rate walking, what was each rate?
A. Bike: 11.5 mph
Hike: 1.5 mph
B. Bike: 13 mph
Hike: 3 mph
C. Bike: 12 mph
Hike: 2 mph
D. Bike: 14.5 mph
Hike: 4.5 mph
Answer: C
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Solve the problem. Round your answer to the nearest tenth, if necessary.Two pipes together can fill a large tank in 10 hr. One of the pipes, used alone, takes 15 hr longer than the other to fill the tank. How long would each pipe take to fill the tank alone?
A. 10 hr; 25 hr B. 15 hr; 30 hr C. 25 hr; 40 hr D. 12.5 hr; 27.5 hr
Simplify the expression. Assume that all variables are positive when they appear.
A. 
B. 
C. 
D. 
Find z1z2. Write your answer in standard polar form with the argument in radians.z1 = 8
, z2 = 3
A. 11
B. 24
C. 24
D. 11
Multiply using the rules for special products.(p - r)(p + r)
A. p2 + r2 B. 2p2 - r2 C. p2 - r2 D. p2 - 2r2