9. the regular price of an item at a store is p
dollars. the item is on sale for 20% off the regular
price. some of the expressions shown below
represent the sale price, in dollars, of the item.
expression a: 0.2p
expression b: 0.8p
expression c: 1 -0.2p
expression d: p -0.2p
which two expressions each represent the sal
price of the item?
a expression a and expression e
b expression b and expression c
c expression b and expression d
d expression c and expression d