Please answer this question in terms of PI

Which of the following expressions is equal to 2x^2+8

What is the value of x in the following equation? -3x-2=2x+8

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