How to factor out a gcf for 8a^2+16=0

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

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?