How do i figure out what the radius and diameter is

20 only answer if 100% sure most high school-aged teens are very active. a. true b. false

Which recursive formula can be used to determine the total amount of money earned in any year based on the amount earned in the previous year? f(n+1)=f(n)+5

If f(x)=3x+1 and f^-1=x-1/3, then f^-1(7)=