Multiply, and then simplify if possible. Assume all variables represent positive real numbers.(
- 
)2
A. 18 - 2
B. 77 - 2
C. -4 - 2
D. 18 + 2
Answer: A
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Convert the improper fraction into a mixed number.
A. 
B. 1
C. 1
D. 2
A university committee decides that there should be three instructors for every 50 students. How many instructors are needed for an enrollment of 5,400 students?
a. 108 b. 1,800 c. 324 d.150
Solve the problem.Robert has built a mechanical model solar system with three balls representing planets at the ends of rods attached to the center representing the sun. The planets are aligned when he turns on the motor. The innermost planet makes a revolution in 12 seconds, the middle planet makes a revolution in 20 seconds, and the outermost planet makes a revolution in 28 seconds. After how many seconds will the planets be aligned again?
A. 210 seconds B. 630 seconds C. 420 seconds D. 840 seconds
Find any values for which the rational expression is undefined. Write your answer with the symbol ?.
A. x ? 0 B. x ? 3, -3 C. x ? 6, 8 D. x ? -6, -8