Find the 100th term of the sequence - 7, 3, 13, 23, ...

-1097

1093

40

First you need to determine which type of sequence is this. Because the difference between 2 successive numbers is constant and it is equal to 10 this sequence is geometric one.

d = 10

To calculate what is the value of some member of this sequence you use formula:

An = Ao + (n-1) * d

where n represents position of element An, Ao is value of first element in the sequence.

Replacing values we get:

A110 = - 7 + 109*10

A110 = 1083.