Prove that if both pairs of opposite sides of a quadrilateral are equal, then the quadrilateral is a parallelogram

Ineed solving this problem h/8=-25 solve for h idk how to this can someone show me and also give an answer you

The mean of a set of data is -3.82 and its standard deviation is 2.31. find the z score for a value of 3.99.

Amira is painting a rectangular banner 2 1/4 yards wide. the banner will have a blue background. amira has enough paint to cover 1 1/2 square yards of the wall. the school colors are blue and yellow, so amira wants to add yellow rectangles on the left and right sides of the blue rectangle. the yellow rectangles will each be 3/4 yards wide and the same height as the blue rectangle. what will be the total area of the two yellow rectangles?