Please help me Write an equation for the nth term of the sequence. Then find a 10.
Answer one or both.

4. 13,9,5,1

5. 1,-2,4,-8

Hart manufacturing had six-month sales of $80 million, with $20 million of that amount from the internet. it set a goal to increase the percentage of total sales coming from the internet by 4 percent in the next six months. the results were total sales of $85 million. if the company meets its goal exactly, what will the dollar amount of internet sales be?