Atextbook store sold a combined total of 343 history and chemistry textbooks in a week. the number of chemistry textbooks sold was 59 less than the number of history textbooks sold. how many textbooks of each type were sold?

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.