Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 2 million liters in it.

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?

Answer for 10 points show work you guys in advanced < 3

The power generated by an electrical circuit (in watts) as a function of its current c (in amperes) is modeled by p(c)= -15c(c-8) what current will produce the maximum power?