Simplify the expression.(-6z2)(7z3)
A. 42z6
B. 12,348z5
C. -42z6
D. -42z5
Answer: D
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Without actually converting, choose the most reasonable answer.The weight of a vitamin is about __________ .
A. 200 kg B. 2 kg C. 20 kg D. 200 g
Solve the rational equation. If there is no solution, state this as your answer.
+ 
= 
A. {8}
B. 
C. {-4}
D. {-8}
Solve the problem.A power boat in still water maintains a speed of 45 miles per hour. The boat heads directly across a river perpendicular to the current which has a speed of 8 miles per hour. Find the actual speed and direction of the boat.
A. 17 miles per hour; 28° off course B. 46 miles per hour; 10° off course C. 22 miles per hour; 21° off course D. 45 miles per hour; 10° off course
Solve the problem.From a point on a straight road, two cars are driven in opposite directions, one at 71 miles per hour and the other at 54 miles per hour. In how many hours will they be 375 miles apart?
A. 3 hours B. Not enough information C. 2 hours D. 4 hours