If y varies directly as x, and y is 20 when x is 4, what is the constant of variation for this relation? A) 1/5

B 4/5

C 5

D 16

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'

Agarden consists of an apple tree, a pear tree, cauliflowers, and heads of cabbage. there are 40 vegetables in the garden. 24 of them are cauliflowers. what is the ratio of the number of cauliflowers to the number of heads of cabbage?

What is always true when two whole numbers are subtracted?