Write an exponential function to model the situation, then find the amount after the specified time.

a population of 120,00 grows 1.2% per year for 15 years.

a. y=1.012(1.2)^x; 15.592
b. y=120,000(1.12)^x; 785,524
c. y=120,000(1.2)^x; 1,848,843
d. y=120,000(1.012)^x; 143,512