3. The points (80, 20) and (120, 30) form a proportional relationship. What is the slope of the line that passes through these points? *

A)1/4
B)4
C)10
D)40

Pls if a cow has a mass of 9×10^2 kilograms, and a blue whale has a mass of 1.8×10^5 kilograms, which of these statements is true?

(25 ! ) what does it mean for an equation to have no solution or infinitely many solutions?

At the county fair, animals are judged for the quality of their breeding and health. the animal pens are arranged in an array, with one animal in each pen. a barn can hold at most 10 rows of pens and at most 6 pens in each row, with room for people to walk around them. what different ways can the planners of the county fair arrange the pens for the horses and cows in the same barn?