How can you tell if three positive numbers form a pythagorean triple?

If f(x) = x+8 and g(x) = 4x- 3, find (f+g)(x)

Look at triangle wxy what is the length (in centimeters) of the side wy of the triangle?

The area (a) of a circle with a radius of r is given by the formula and its diameter (d) is given by d=2r. arrange the equations in the correct sequence to rewrite the formula for diameter in terms of the area of the circle.