John starts out with $10 in his savings account and his grandparents add $10 a week. What is the recursive formula to represent how much money John has any time after two weeks?

Question

A. f(n) = f(n-1)+10, given f(1) = 10

B. f(n) = 10f(n-1), given f(1) = 10

C. f(n) = f(n-2)+10, given f(1) = 10

D. f(n) = 10(n-1), given f(1) = 10

Answer 1

A. f(n) = f(n-1)+10, given f(1) = 10

10(3)=10(3-1)+10

=20+10=30

This is for the first 3 weeks. Change "n" for any amount of weeks.