Which property is shown? 5 + [(-3x + 4] = [5 + (-3x)] + 4 a. associative property of addition b. commutative property of addition c. commutative property of multiplication d. associative property of multiplication

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{ {