Answers

The Brainliest Answer!
2016-07-16T17:54:59+08:00
An = term
a1 - first term
n - number of terms
d - common difference

an = a1 + (n-1)d 

1. 
a15 = 5 + (15-1) 3

a15 = 5 + 42

a15 = 57

3.
a11 = -20 + (11-1) (5)

a11 = -20 + 50

a11 = 30


4.
a8 = x+1 + (8-1) (x + 2)

a8 = x + 1 + 7x + 14

a8 = 8x + 15

5.
a10 = x-2 + (10-1) (3x+2)

a10 = x-2 + 27x + 18

a10 = 28x + 16

I apologize for skipping number 2. hehe sorry.
2 5 2