Is this a function or not a function? (Picture)

Will used 20 colored tiles to make a design in art class. 5/20 of his tiles were red. what is an equivalent fraction for the red tiles?

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

John has 1/2 pound of oranges to share with julie. if they share the oranges equally, how much will each of them have?