How can you tell when a pattern shows counting on by tens?

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 all work to identify the discontinuity and zero of the function f of x equals 6 x over quantity x squared minus 36

Multiply the polynomials (x+3)(x^2-6x+5)