A Population Is Increasing According to the Exponential Function Defined $y = 3 \mathrm { e }$

question 250

Multiple Choice

A population is increasing according to the exponential function defined by $y = 3 \mathrm { e }$ - $04 \mathrm { x }$ , where $\mathrm { y }$ is in millions and $x$ is the number of years. Which of the following should be done in order to answer the question "When will the population reach 4 million?"

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

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