How do u solve these questions i have no clue

Which of the following tables represents exponential functions?

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 (monthly car loan payment per $1,000 borrowed) i need !

You are at a restaurant and owe $56.20 for your meal. you want to leave an 18% tip. approximately how much is your tip?