What's the geometric mean of these two numbers? 8.5 and 12.4

Match each function with its rate of growth or decay

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.

If a company produces x units of an item at a cost of $35 apiece the function c=35x is a of the total production costs