Solve. -The Population of a Particular City Is Increasing at a a Rate

Multiple Choice

Solve.
-The population of a particular city is increasing at a rate proportional to its size. It follows the function t where k is a constant and t is the time in years. If the current population is 42,000, in how many years is the population expected to be 105,000? (Round to the nearest year.)

A) 93 yr
B) 13 yr
C) 6 yr
D) 7 yr