Please help! What is the perimeter of Trapezoid? (ABCD)

Answer and explanation please! <3

The spotter on the ground is standing beneath the safety net. what is his distance from the base of the platform, to the nearest meter? 3 meters, 2 meters, 4 meters, 1 meter?

Which point on the x-axis lies on the line that passes through point c and is parallel to lino ab?

Find dy/dx using implicit differentiation ln(20+e^xy)=y