Translate the sentence into a mathematical equation. Be sure to identify the meaning of all symbols.The surface area of a sphere is 4? times the square of the radius.
A. If S represents the surface area and r the radius, then S = 4?r2.
B. If S represents the surface area and r the radius, then S = 4?r.
C. If S represents the surface area and r the radius, then 4?S =r2.
D. If S represents the surface area and r the radius, then S = ?r2.
Answer: A
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Express the verbal representation for the function f graphically.Square the input x to obtain the output y.
A. 
B. 
C. 
D. 
Solve using the percentage formula.What percent of 10 is 
?
A. 7% B. 5.5% C. 10% D. 5%
Solve the problem.The number of DVDs (in thousands) sold by a leading retailer has been decreasing due to the introduction of online streaming services.
Let S be the number (in thousands) of DVDs sold t years since the year 2013. A model of the situation is 
Predict the number of DVDs that will be sold in the year 2020.
A. 1000 B. 10 C. 100 D. 10,000
Solve the problem.The length of the diagonal of a rectangle is given by 
where L and W are the length and width of the rectangle. What is the length of the diagonal, D, of a rectangle that is 16 inches long and 2 inches wide? Round your answer to the nearest tenth of an inch, if necessary.
A. 5.7 inches B. 16.1 inches C. 4.2 inches D. 15.9 inches