Solve.A tank is in the shape of a cylinder 3 feet tall and 4 feet in radius. Find the exact surface area of the tank.
A. 14? sq ft
B. 42? sq ft
C. 56? sq ft
D. 48? sq ft
Answer: C
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Solve the problem.The tuning frequency f of an electronic tuner is inversely proportional to the square root of the capacitance C in the circuit. If 
for 
find how fast f is changing at this frequency if 
A. -120 pF/s B. -47.9 pF/s C. 364 pF/s D. -95.8 pF/s
Express the number in scientific notation.0.0000004
A. 4 × 10-6 B. 4 × 10-8 C. 4 × 10-7 D. 4 × 10-9
Solve the problem.Suppose that you roll a pair of honest dice. If you roll a total of 6, you win $18; if you roll a total of 11, you win $72; if you roll any other total, you lose $9. Let X denote the payoff in a single play of this game. Find the expected value of a play of this game. Round your answer to the nearest penny.
A. $0.75 B. $-0.75 C. $-0.50 D. $-1.00 E. $0
Write the compound inequality as two separate inequalities.
