Multiple questions for 1 exponential equation

Question

1. Alexia has $350 in a bank account. After one year, she has $350 ⋅ 1.02 = $357 dollars in the account. How much interest does the bank account earn each year as a percentage? 
2. After two years, she has $350 ⋅ 1.02 = $364.14 dollars in the bank account. Suppose we wanted to know how much money Alexia had in the bank account after 4 years. How many times would we need to multiply by 1.02? 
3. Suppose f(x)= A ⋅ B^x is an exponential function describing how much money Alexia will have in her bank account after x years. What would A and B be?

Answer 1

0.02= 2% annual interest

350(1.02)^4 = 350(1.02)(1.02)(1.02)(1.02) = $378.85 after 4 years

after x years, A=350, B=1.02

350(1.02)^x