8. Two and a half laps of a running track equal 1 km. Write an expression and determine how many laps equal 3 km.

6. sarah saved $12.75 every week for a number of weeks, w. she received an additional $25 during the last week in which she saved money. write and solve an equation to find the number of weeks, w, for which sarah had saved money if she has $114.25 now.