Question

25 Points!! The graph represents the first three terms in an arithmetic sequence.

a. Find the explicit expression for this sequence
b. Find the recursive expression for this sequence
c. What is the 15th term?

Answer 1

I solved the sum and added it in the attachment!

Answer 2

Explanation:

`y-1=(4-1)/(2-1)(x-1)\\y-1=3(x-1)\\y=3x-3+1\\y=3x-2`

b.

an=an-1+3

C.

when x=15

y=3×15-2=45-2=43

a15=43