Please help me solve this(2a+5b) (a- b)

What is the solution set of the quadratic inequality x^2-5< or equal to 0

Equation for the calculation double 2 and then add 5

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?