Is y=2.5x proportional or non proportional

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

You earn a 12% commission for every car you sell. how much is your commission if you sell a $23,000 car?

Afrequency table of grades has five classes (a, b, c, d, f) with frequencies of 3, 13, 14, 5, and 3 respectively. using percentages, what are the relative frequencies of the five classes?