An equation that expresses the relationship between the lengths of square root of 5,3,8

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?

An ulcer medication has 300 milligrams in 2 tablets. how many milligrams are in 3 tablets?

F(x) = 1/x g(x)=x-4 can you evaluate (g*f)(0) ? why or why not?