Which equation represents a proportional relationship? I need the answer for BOTH questions.

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

John bought 5 lemons and used 2 of them for a salad how much did he use for.a salad . he used % of the lemons.

What is the value of the expression below? (81^2)^1/8