Me with this! send ! lol in advance

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 !

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year