What is the slope of the line through (-1, -7) and (3,9)?

Which expression will have the same sum as 3_8 + 1/4?

Is this a polynomial function? i need to know asap

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.)