An object is launched from a platform. Its height in meters, x seconds after the launch, is modeled by −3(x+4)2+108. After how many seconds does the object reach the max. height? What is the max. height?

The life (in hours) of a magnetic resonance imagining machine (mri) is modeled by a weibull distribution with parameters β = 2 and δ = 370 hours. (a) determine the mean life of the mri. (round your answer to 2 decimal ) determine the variance of the life of the mri. (round your answer to 1 decimal ) what is the probability that the mri fails before 250 hours? (round your answer to 4 decimal places.)