8.702 what value is the 2

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

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?

Solve the formula ax+ by = c for x.