Determine if each set of ordered pairs represents a function.

Find three consecutive numbers such that the sum of one-fourth the first and one-fifth the second is five less than one-seventh the third

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

15m is what percent of 60m; 3m; 30m; 1.5 km? the last one is km not m