Write the Word or Phrase That Best Completes Each Statement $\mathrm { P }$

Short Answer

Write the word or phrase that best completes each statement or answers the question.
-The size $\mathrm { P }$ of a certain insect population at time $\mathrm { t }$ (in days) obeys the function $\mathrm { P } = 700 \mathrm { e } ^ { 0.03 \mathrm { t } }$ . After how many days will the population reach 1500 ?