Ok now iam stuck on this one math is not my thing pls you

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

If f(x) = 2x + 8 and g(x) = x4, what is (gº)?

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.