Solve the problem.Suppose the consumption of electricity grows at 5.1% per year, compounded continuously. Find the number of years before the use of electricity has tripled. Round the answer to the nearest hundredth.
A. 0.22 yr
B. 58.82 yr
C. 21.54 yr
D. 2.15 yr
Answer: C
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Use the graph of population change per year for a metro area to answer the question. 
In which two years did the population of the metro area increase?
A. 1998 and 1999 B. 1999 and 2000 C. 1997 and 2001 D. 2000 and 2001
Identify the multiplication model that best fits the problem. Do not solve the problem.Kari drives 12 miles round trip each day to work. If she works 4 days each week, how many miles each week does she drive to work?
A. Set model B. Array model C. Measurement model D. Cartesian product model
Find the surface area of the circular solid. Unless otherwise specified, use 3.14 for ? and round your answer to the nearest tenth.A right circular cone with r = 10 cm, h = 5 cm (Use the formula S = ?r 
+ ?r2.)
A. 78.5 cm2 B. 157.0 cm2 C. 665.1 cm2 D. 314.0 cm2
Write the decimal number in words.6.48
A. six and forty-eight thousandths B. six and forty-eight hundredths C. six and forty-eight tenths D. six and forty-eight millionths