Today, everything at a store is on sale. The store offers a 20% discount. If the regular price of an item is x dollars, what is the discount price in dollars?

0.8x or x-0.2x
0.9x
0.7x
0.6​

This is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 4 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 3 terms. this is a rational expression because the denominator contains a variable. this is a polynomial with 5 terms.