Write the Word or Phrase That Best Completes Each Statement $\mathrm { y } = 3 \mathrm { e } \cdot 04 \mathrm { x }$

Multiple Choice

Write the word or phrase that best completes each statement or answers the question.
-A population is increasing according to the exponential function defined by $\mathrm { y } = 3 \mathrm { e } \cdot 04 \mathrm { x }$ , where $\mathrm { y }$ is in millions and $\mathrm { x }$ 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 $3 \mathrm { e } \cdot 04 \mathrm { x } = 4$ .
B) Evaluate $y = 3 \mathrm { e } \cdot 04 ( 4 )$ .
C) Evaluate $y = 3 e ^ { - 04 ( 1 / 4 ) }$ .
D) Solve $3 \mathrm { e } \cdot 04 \mathrm { x } = 12$ .