Express the statement as an equation involving the indicated variables.The surface area S of a sphere is 4 times ? times the square of the radius r.
A. S = 4?r2
B. S = 4? 
C. S = 4?r
D. S = ?r2
Answer: A
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Solve.The average value of a certain type of automobile was $20,460 in 2006 and depreciated to $14,880 in 2011. Let y be the average value of the automobile in the year x, where x = 0 represents 2006. Write a linear equation that relates value y to year x.
A. y = -1116x + 9300
B. y = - 
x - 14880
C. y = -1116x + 14,880
D. y = -1116x + 20,460
Solve for x: x2 - 2x - 8 = 0
a. x = 2, 4 b. x = 2, -4 c. x = 6, 0 d. x = 3, -3 e. x = -2, 4
Perform the indicated operations and simplify the expression.
?
?
A. 
B. 
C. 
D. 
E. 
Solve the polynomial inequality and graph the solution set on a number line. Express the solution set in interval notation.(x - 2)(x + 8) > 0
A. (-8, ?)
B. (-8, 2) 
C. (-?, -8) ? (2, ?)
D. (-?, -2) ? (8, ?)