Which is faster, the tortoise or the turtle?

How do you find principle and simple interest

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?

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