Two Sun City had the population of 15,000 in 1985. It was then that Two Sun's population growth began to increase at the rate of 600 people every year. Based upon this model, respond to the following:
a) Write down an equation for the function.
b) Is the function linear or non-linear.
c) Determine the independent variable?
d) Estimate the dependent variable?
e) Project how many Two Sun City residents there will be in 2014.