Question

Which of the following equations could be used to solve for the tenth term of the following sequence? 15, 13, 11, 9, ...

Answer 1

This is an arithmetic sequence, where the first term (a) is 15 and the common difference (d) is -2.
The general formula for the nth term of an arithmetic sequence is:

`n_(th\ term) =a+(n-1)d`
Therefore the required equation is:

`10_(th) \ term=15+(10-1)*-2`