Which of the following belongs to the set of natural numbers? -5 5 0 -10

Aiden drives to school and back each day. the school is 16 miles from his home. he averages 40 miles per hour on his way to school. if his trip takes 1 hour, at approximately what speed does aiden drive home?

For f(x) = 3x+1 and g(x) = x2 - 6, find (g/f)(x)

8. kelly wants to buy a magazine that is $25. later the magazine was marked up an additional 20%. what is the new price?