PLS I BEG U HELP 50 points and brainlist to correct answer PLS help I CAN even Venmo u but help answer as many as u can (and don’t guess pls)

When are two distinct non vertical lines parallel

Two cyclists 84 miles apart start riding toward each other at the samen time. one cycles 2 times as fast as the other. if they meet 4 hours later what is the speed (in miles) of the faster cyclists

What numbers are included in the set of integers? what numbers are not included?