Solve the formula for the specified variable.S = 2?rh + 2?r2 for h
A. h = 
B. h = 
- 1
C. h = S - r
D. h = 2?(S - r)
Answer: A
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Approximate the square root. Round to the nearest tenth, if needed.
A. 83 B. 830 C. 3444.5 D. 88
Solve the problem.The number of mobile phones sold in a given year is approximated by 
where x represents the number of years since mobile phones became readily available. The corresponding polynomial for phones is 
Find the polynomial that represents how many more mobile phones than phones were sold in a given year.
A. -4x4 + x3 + 5x2 - 9x + 11 B. 4x4 - x3 + 13x2 - 3x + 9 C. -4x4 - x3 - 2x + 10 D. -4x4 + x3 + 12x2 + 3x - 9
Find the expected value.A fair coin is tossed three times, and a player wins $3 if 3 tails occur, wins $2 if 2 tails occur and loses $3 if no tails occur. If one tail occurs, no one wins. What is the expected value of the games?
A. $0.75 B. $2.00 C. -$3.00 D. $3.00
Simplify. Assume that all variables represent non-negative real numbers.
A. 8x
B. 
C. 4x
D. 