11-(15g - 13) = what do i do with the subtraction sign? i don’t know if i should make it a negative 15 or just ignore it, it’s due in 10 mins

The patient recovery time from a particular surgical procedure is normally distributed with a mean of 5.2 days and a standard deviation of 1.7 days. what is the probability of spending more than 2 days in recovery? (round your answer to four decimal places.)