Write the Word or Phrase That Best Completes Each Statement $k > 0$

Short Answer

Write the word or phrase that best completes each statement or answers the question.
Provide the missing information.
-If $k > 0$ , the equation $y = y _ { 0 } e ^ { k t }$ is a model for exponential (growth/decay), whereas if $k < 0$ , the equation is a model for exponential (growth/decay).