Fast if f(x)=3x^3 and g(x)=-2x^2 which expression represents f(g( a. -24x^5 b.-24x^6 c.-18x^6 d.-8x^6

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.