help please show your complete solution (typewritten and make it legible solution)

given:

formula:

solution:

A 13ft-long ladder leans against the side of a wall. The top of the ladder is sliding down the wall at the rate of 5 ft/sec. How fast is the foot of the ladder moving away from the building when the top is 8 feet above the ground? *Input numerical answer only in two decimal places. Do not include units