One of the steps dave used to solve an equation is shown below. 3x+9=21 3x+9−9=21−9 which statement describes the procedure dave used in this step and identities the property that justifies the procedure? a) dave rearranged the terms. this procedure is justified by the associative property. b) dave subtracted 9 from both sides. this procedure is justified by the additive property of equality. c) dave rearranged the terms. this procedure is justified by the commutative property. d) dave subtracted 9 from both sides. this procedure is justified by the additive inverse.
Ariel is working at a meat packing plant for 5 nights a week. her regular wage is $11 an hour. she earns tine and a half for any overtime hours. this week she worked 9 hours of over time .how much will ariel earn for overtime this week ?