Three terms of an arithmetic sequence are shown below. which recursive formula defines the sequence? f(1)=6,f(4)=12,f(7)=18

our sequence is f(n) = f(n-1) + 2

where f(1) = 6

Step-by-step explanation:

An arithmetic sequence is a sequence where the difference between any two succesive terms is the same:

so here we have that:

f(1) = 6

f(4) = 12

f(7) = 18

we would have that:

f(2) - f(1) = c

f(3) - f(2) = c

f(4) - f(3) = c

then we can add those 3 equations and get:

(f(2) - f(1)) + (f(3) - f(2)) + (f(4) - f(3)) = c + c + c

f(4) - f(1) = 3c

12 - 6 = 3*c

6 = 3*c =

c = 6/3 = 2

now, then we must have that:

f(7) - f(4) = 3*c = 6

18 - 12 = 6

so this is consistent.

then our sequence is f(n) = f(n-1) + 2

where f(1) = 6

x = 12

y = 15

step-by-step explanation:

answer: 1inch=7days  

12inch=12*7=84days

step-by-step explanation: