Which equations represent a proportional relationship? If they do, give the constant of proportionality.

1) m = 7.2n

2) 8b = a

3) f = 9/5c + 32

4) y = x/5

Rai compares two cable plans from different companies. which equation gives the correct value of mm, the number of months for which plans a and b cost the same?

Present age of man is 45 years, 5 years back his age was 4 times age of his son what is present age of his son?

Find the equation of the ellipse with the following properties. the ellipse with foci at (0, 6) and (0, -6); y-intercepts (0, 8) and (0, -8).edit: the answer is x^2 over 28 + y^2 over 64 = 1