Why is finding the sum in math so important?

Write the equation below the represents the line passing through the point (-3, -1) negative one with a slope of 4

Louis wants to carpet the rectangular floor of his basement.the basement has an area of 864 square feet.the width of the basement is 2/3 it's length. what is the length of louis's basement

Evaluate each expression. determine if the final simplified form of the expression is positive or negative -42 (-4)2 42