Add or subtract. Assume all variables represent positive real numbers.
+ 
+ 
+ 
A. 20
+ 17
B. 
+ 
+ 17
C. 6
+ 17
D. 6
+ 
+ 
Answer: C
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Express the number in decimal notation.7 × 10-7
A. 0.0000007 B. -700,000 C. 0.00000007 D. 0.000007
Solve the problem.The number of periods needed to double an investment when a lump sum is invested at 10%, compounded semiannually, is given by n = log1.05 2. Find the number of years before the investment doubles in value, to the nearest tenth of a year.
A. 3.6 years B. 7.1 years C. 14.2 years D. 28.4 years
Find the domain of the logarithmic function.f(x) = log7(x2 + 4x + 4)
A. (-2, ?) B. (-?, -2) ? (-2, ?) C. (2, ?) D. (-?, 0) ? (0, ?)
Solve the problem.The population of a particular country was 22 million in 1984; in 1995, it was 34 million. The exponential growth function 
describes the population of this country t years after 1984. Use the fact that 11 years after 1984 the population increased by 12 million to find k to three decimal places.
A. 0.040 B. 0.602 C. 0.050 D. 0.226