How can you tell if a relationship is proportiond?

If f(x)=x^3 and g(x)=2x+7 when g(x)=-5

In the figure shown below, m < 40 and ab =8. which equation could be used to find x?

Aclothing store has the sign shown in the shop window. pani sees the sign and wants to buy 3 shirts and 2 pairs of jeans. the cost of each shirt before the discount is $12, and the cost of each pair of jeans is $19 before the discount. write and simplify an expression to find the amount pani pays if a $3 discount is applied to her total