Can anybody help me on this one ;-;

The roots of the function f(x) = x2 – 2x – 3 are shown. what is the missing number?

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?

3.4a=57.8 what is the the value of a