John starts out with $10 in his savings account and his grandparents add $10 a
week. write a recursive formula to represent how much money john has any time
after two weeks.
f(n) = f(n − 2) + 10, given f(1) = 10
f(n) = 10(n − 1), given f(1) = 10
f(n) = 10f(n − 1), given f(1) = 10
f(n) = f(n-1) +10, given f(1) = 10