Question

Three terms of an arithmetic sequence are shown below. Which recursive formula defines the sequence?

f(1) = 6, f(4) = 12, f(7) = 18

Answer 1

so before all do you know what mean an aritmetic sequence ?

and than you see there from these given details result that when

x = 1 => y = 6
x = 4 => y = 12
x = 7 => y = 18

so a little help again - than you check these results when x increase by 3 y increase by 6

yes ? so hope helped understandably