Ineed the answer at joe's market, three oranges and one apple cost $1.86, and two oranges and three apples cost $2.15. what is the cost of one apple?

15. jiovanni is looking in to two different companies that offer study guides for math exams.test prep 101 charges a $5 flat fee and an additional $0.25 per problem.math charges a $2 flat fee and an additional $0.50 per problem.how many prablems would make the costs of the two companies be equal? varibles: equations/eniqualities{ {