Use natural logarithms to solve the exponential equation symbolically.4(7 - 3x) = 
A. x = 
- 7
B. x = 
- 
C. x = 
+ 
D. x = - 
+ 21
Answer: C
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?John made $33,000 a year last year. This year he made $38,980. What percent of increase to the nearest 1/10 of a percent did he make? ?
A. 18.1% B. 19% C. 20.8% D. 17.9% E. 17.55%
The initial value of one exponential function is 40, and the growth factor is 1.05. The initial value of a second exponential function is 90, and the decay factor is 0.95. If 
is the independent variable for both functions, for what value of t are the two functions equal? Round your answer to two decimal places.
?
A. ?
B. 
C. 
D. 
Express the number in scientific notation.870,000
A. 8.7 × 105 B. 8.7 × 104 C. 8.7 × 10-4 D. 8.7 × 10-5
Provide an appropriate response.The formula for voltage is V = 
, where V is the voltage, W is the wattage, and A is the amperage. Write an equation and solve to find the wattage if the voltage is 4.2V and the amperage is 12.5A.
Fill in the blank(s) with the appropriate word(s).