What are the factors in the expression 4x (3x^2 + 5y)?

If f(x) =3x-2 and g(x) =2x+1 fins (f+ g) (x)

Icould really use some with this question.

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days