1. A motorcycle speeds up from an initial speed of 5.0 m/s at a rate of 2.3 m/s2. How fast is it going after 12 s?

The answer is C
it's easier if you graph it
we know that the x of the unknown vertice is 4, because this is a rectangle and that vertices has to be on the same x line as the point below.
y of the unknown vertice has to be 1 because the vertice to the left needs to be on the same y line as the unknown vertice