Solve.A stack of firewood is 8 feet long, 6 feet wide, and 9 feet tall. Find the volume of the stack.
A. 576 ft3
B. 432 ft3
C. 288 ft3
D. 486 ft3
Answer: B
Mathematics
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Evaluate.
, when x = 21 and y = 63
A. 15 B. 294 C. 10 D. 42
Mathematics
Solve the problem.In a school survey, students showed these preferences for instructional materials. 
About how many students would you expect to prefer computers in a school of 700 students?
A. About 126 students B. About 36 students C. About 252 students D. About 140 students
Mathematics
Solve the system.4x - 7y - z = -17x + 3y - 5z = -93x + y + z = 21
A. {(4, 5, 4)} B. ? C. {(4, 4, 5)} D. {(-4, 4, 8)}
Mathematics
Simplify the exponential expression.(x4)-8
A. - x32
B. 
C. -8x4
D. -8x32
Mathematics