Solve for x. Type your answer below.

5(2x−12)=​−90

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

Math i have no idea how to do a and b

Ineed here’s a picture of the question