-3х + 25 = 40
I need help

Determine whether the quadrilateral below is a parallelogram. justify/explain your answer (this means back it up! give specific information that supports your decision. writing just "yes" or "no" will result in no credit.)

If two parallel lines are cut by a transversal, interior angles on the same side of the transversal are supplementary. a. always b. sometimes c. never

For the right triangle shown, the lengths of two sides are given. find the third side. leave your answer in simplified, radical form.