A reflection over the x-axis and y-axis produces the same result as what other transformation?

Find the greatest common factor of the polynomial: 10x^5+15x^4-25x^3 10x^5 x^3 5x^3 5

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Two cyclists 84 miles apart start riding toward each other at the same. one cycles 2 times as fast as the other. if they meet 4 hours later, what is the speed (in mi/h) of the faster cyclist?