Please help! What's the Perimeter of Trapezoid ABCD?

Answer and explanation please! <3

What is the average rate of change for this function for the interval from x=2 to x=4 ?

What is the area of the trapezoid shown ?

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.