ADD EXPLANATION What is the initial value of the function represented by this graph?

A coordinate grid is shown with x- and y axes labeled from 0 to 7 at increments of 1. A straight line joins the ordered pair 0, 3 with the ordered pair 7, 6.

0
3
6
7

An arc subtends a central angle measuring 7pi/4 radians what fraction of the circumference is this arc?

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?

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?