Abicyclist rose 3.5 miles in 15 minutes. what was her average speed, in miles per hour?

Can you simplify 4/7? 24 points will be awarded!

Find the slope of the line below . enter your answer as a fraction or decimal. use a slash mark ( / ) as the fraction bar if necessary

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie