PLEASE HELP ASAP DUE SOON

Acircle has a circumference of 28.36 units what is the diameter of the circle

Linda loans her friend $250 with a 5% monthly intrest rate. how much was the whole loan?

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?