Ineed whit graphing linear equations

Mr. and mrs. wallace have decided to buy a car for $21,600. they finance $15,000 of it with a 5-year auto loan at 2.9% arp. what will be their monthly payment be? a. $268.20 b. $268.86 c. $269.54 d. $387.16 i need !

The function f(x) = 14,600(1.1)* represents the population of a town x years after it was established. what was the original population of the town?

I’m really confused and need your assist me with this question i’ve never been taught