Hello again, can i also arrows instead of the foil method when working with x+5) (4x-14)

Angela is buying a dress that is on sale for 20% off. if the original price of the dress is $40.00, how much money is angela saving on the dress? a. $0.80 b. $3.20 c. $32.00 d. $8.00

Can someone me out here number 4 plz

Find the condition that the zeros of the polynomial f(x) = x^3+3px^2+3px+r may be in a.p.