Who wanna talk bc im bored

How can you tell when x and y are not directly proportional?

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?

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2