Avery has a total of $12.50 in her piggy bank at home. each week she takes out $1.25 to ride the city bus. write an equation representing the balance, c, in the piggy bank, where w is the number of weeks. c = 1.25w – 12.50 c = 1.25w 12.50 c = –1.25w 12.50 c = –1.25w – 12.50