What is x/6-3=15 find for x

Show your workcan a right triangle have this sides? *how to prove it without using the pythagorean theorema*

If f(x) and g(x) are inverse functions of each other, which of the following shows the graph of f(g(x)

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side then from the larger side of the rectangle. the perimeter of the rectangle is equal to 56 cm. find the lengths of the sides of the rectangle. 16 points answer quick