Helps me solve this problem please

Lassify the function as linear or quadratic and identify the quadratic, linear, and constant terms. f(x) = (3x + 2)(−6x − 3) linear function; linear term: −21x; constant term: −6 linear function; linear term: −18x2; constant term: −6 quadratic function; quadratic term: 6x2; linear term: 24x; constant term: −6 quadratic function; quadratic term: −18x2; linear term: −21x; constant term: −6

What is the measure of ac? 5 units 13 units 26 units 39 units

Given the equation f(x)=a(b)x where the initial value is 40 and the growth rate is 20% what is f(4)