Use the Laws of Exponents to simplify. Write the answer with positive exponents. All variables are nonzero.(x-1y5)-2
A. 
B. 
C. 
D. 
Answer: C
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Solve the problem. Round your answer to the nearest tenth unless otherwise indicated.Brett and Helina went on a 52-mile canoe trip with their class. On the first day they traveled 13 miles. What percent of the total distance was that?
A. 4% B. 400% C. 0.25% D. 25%
Simplify the expression by using the order of operations.3 ? 9 - 2
A. 54 B. 21 C. 25 D. 29
Solve the problem.The price p and the quantity x sold of a certain product obey the demand equation p = - 
x + 160, 0 ? x ? 480.What quantity x maximizes revenue? What is the maximum revenue?
A. 360; $14,400 B. 480; $19,200 C. 120; $14,400 D. 240; $19,200
Solve the system of equations.5x + 2y + z = -112x - 3y - z = 177x + y + 2z = -4
A. (0, 6, -1) B. (0, -6, 1) C. (3, 0, -4) D. (-3, 0, 4)