Question

Find the 5th term of the
sequence: -8,-1, 6, 13...

Answer 1

20

Explanation:

a = -8

d = -1 - (-8) = 7

An = a + (n - 1)d

A5 = -8 + (5 - 1)(7)

A5 = -8 + 28

20

Answer 2

20

Explanation:

We need to determine what we are adding each time.

Take the 2nd term and subtract the first term

-1 - (-8)

-1 +8 = 7

We add 7 each time

To find the 5th term, add 7 to the 4th term

the 4th term is 13

13+7 = 20