Please show me the procedure o 4+(-2)

Write an explicit formula that represents the sequence defined by the following recursive formula:

Can some one me with these questions

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.)