Find the slope of the line that goes through each pair (1,3) (1,-10)

According to the normal model, what percent of receivers would you expect to gain fewer yards than 2 standard deviations below the mean number of yards

How do you use the elimination method for this question? explain, because i really want to understand!

Alex took his brother to a birthday party. the party was scheduled to last for 1 and 3/4 hours but they stayed for 4/5 of an hour more. how long did she stay at the party?