Solve the problem.Sales (in thousands) of a certain product are declining at a rate proportional to the amount of sales, with a decay constant of 8% per year. By writing and solving a differential equation, determine how much time will pass before sales become 60% of their original value.
A. 5.7 years
B. 7.3 years
C. 6.8 years
D. 6.4 years
Answer: D
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Perform the indicated operation.
+ 
A. 
B. 
C. 
D. 
Solve the problem.In Country X, the average hourly wage in dollars from 1945 to 1995 can be modeled by f(x) = 
Use f to estimate the average hourly wages in 1950, 1970, and 1990.
A. $3.42, $0.34, $6.75 B. $0.73, $3.03, $6.75 C. $0.73, $2.27, $6.75
Solve the problem.Ohm's law relates the current in a circuit, I, in amperes, the voltage of the circuit, V, in volts, and the impedance of the circuit, Z, in ohms, by the formula 
Find the current I when the impedance is and voltage is V = -3i volts.
A. 
amperes
B. 
amperes
C. 
amperes
D. (-9 + 3i) amperes
Fill in the blank with one of the words or phrases listed below. Some words or phrases may be used more than once.
logarithms are logarithms to base e.
A. Common B. Inverse C. Natural D. Exponential