The sporting goods store where the campers purchased their backpacks can sell 90 packs for $200 each. For every $10 decrease in price, 5 more packs will be sold. The
number of backpacks that must be sold to generate revenues of $12 000 is:

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.