Find the volume of a shipping container in terms of x with the given dimensions, length of x+1, width of x-4, and height of x + 8

The length of time it takes to find a parking space at 9 a.m. follows a normal distribution with a mean of 5 minutes and a standard deviation of 2 minutes. find the probability that it takes at least 8 minutes to find a parking space. (round your answer to four decimal places.)