If Z is the standard normal variable, then what is P(-4< Z < 2.1)?

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

Factor the expression using gcf 9b+45

Answer pls man im trying to get out of summer school