I need help with this I will mark you brainlest if correct

Match each function with the corresponding function formula when h(x)=5-3x and g(x)=-3+5

Which of the following is not a subset of {1,2,3}?

Tommy buys a sweater that is on sale for 40% off the original price. the expression p -0.4p can be used to find the sale price of the sweater, where p is the original price of the sweater. if the original price of the sweater is 50, what is the sale price?