Simplify the expression. Assume that all variables represent non-negative real numbers.9x
- 12y
+ 6x
A. 3x2
B. 3xy
C. 
(15x - 12y)
D. y
(15x2y - 12)
Answer: C
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Solve the problem.The amount of water used to take a shower is directly proportional to the amount of time that the shower is in use. A shower lasting 17 minutes requires 8.5 gallons of water. Find the amount of water used in a shower lasting 4 minutes.
A. 36.125 gallons B. 8 gallons C. 2.125 gallons D. 2 gallons
Determine whether the given function is positive or negative for values of t in the specified quadrant. Quadrant III, cos t
A. Negative B. Positive
Solve the equation. Use natural logarithms. When appropriate, give solutions to three decimal places unless otherwise indicated.ln e9x = ?
(Give the exact solution.)
A. 
B. {9?}
C. 
D. {? - 9}
Compute, rounding to the nearest tenth.612 ÷ 24.0
A. 26.5 B. 25.5 C. 2.6 D. 255.0