Mrs. Sorenstam bought one ruler, one compass, and one mechanical pencil at the prices shown in the table for each of her 12 students. a. Suppose Mrs. Sorenstam had 36 cents left after buying the school supplies. Write an equation to find the amount of money Mrs. Sorenstam initially had to spend on each student.
Each week, Payat spends a portion of his allowance to download music. The table shows the cumulative amount that he spent on music downloads during a three-week period.At the end of Week 3, Payat had $9 left. Which equation can be used to find the amount of Payat’s weekly allowance a?