Find T. Is it 7 or -1

Asmall business produces and sells balls. the fixed costs are $20 and each ball costs $4.32 to produce. each ball sells for $8.32. write the equations for the total cost, c, and the revenue, r, then use the graphing method to determine how many balls must be sold to break even.

Matt had 5 library books. he checked out 1 additional book every week without retuening any books. whats the matching equation

Tanyss's house has 25 windows. her brother has washed 22 of the windows. what percent of the windows has her brother washed?