Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
-A population is increasing according to the exponential function defined by y $$y = 3 e ^ { - 04 x }$$ , where y is in millions and x is the number of years. Which of the following should be done in order to answer
The question "How long will it take for the population to quadruple?"

A) Solve $3 e ^ { \cdot 04 x } = 4$
B) Solve $3 e ^ {\cdot 04 x} = 12$ .
C) Evaluate $y = 3 \mathrm { e } ^ { .04 ( 1 / 4 ) }$
D) Evaluate y $= 3 \mathrm { e } ^ { .04 ( 4 ) }$ .