Divide. Simplify, if possible.- 2 ÷ 
A. - 
B. - 2
C. - 
D. - 12
Answer: D
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The data in the figure below represents the annual salaries of 120 professional mathematicians.
Which of the following values is the best estimate of the standard deviation of this data?
A. $40,000 B. $490,000 C. $5000 D. $70,000 E. $20,000
Factor completely.(x + y)3 + (x - y)3
A. 2x(x2 - 3y2) B. x(x2 - 3y2) C. 2x(x2 + 3y2) D. x(x2 + 3y2)
Solve the problem.The rate of expenditure of a particular machine is given by 
where x is time measured in years. Maintenance costs through the second year are $88. Find the total maintenance function.
A. M(x) = 15(x2 + 5)3/2 - 47 B. M(x) = 15(x2 + 5)3/2 + 73 C. M(x) = 5(x2 + 5)3/2 + 73 D. M(x) = 5(x2 + 5)3/2 - 47
Eliminate the parameter to express the parametric equations as a single equation in x and y.x = 7 cos t, y = 7 sin t
A. x2 - y2 = 7 B. x2 - y2 = 49 C. x2 + y2 = 7 D. x2 + y2 = 49