Final answer:
To create the largest cubicle using 300 feet of wall, given three sides enclosed, the optimal dimensions are a length (shorter side) of 112.5 feet and a width (longer side) of 75 feet.
Step-by-step explanation:
To determine the dimensions for the largest possible cubicle with 300 feet of cubicle wall, we need to maximize the area of the rectangular cubicle with three walls, since one side is open. The perimeter of the cubicle with three sides can be represented as P = 2l + w, where l is the length of the longer side, w is the length of the shorter side (the width), and the total available wall material is P = 300 feet. We want to maximize the area A = l * w. Using the perimeter formula, we can express the width in terms of the length: w = 300 - 2l. Substituting this into the area formula, we get A = l * (300 - 2l) = 300l - 2l^2.
To find the maximum area, we can take the derivative of A with respect to l, set it equal to zero, and solve for l. dA/dl = 300 - 4l = 0, so l = 75 feet. Plugging this back into the expression for w gives w = 300 - 2*75 = 150 feet. However, since the cubicle has only three sides, we need to calculate the width by dividing the remaining wall material by two. Thus, the width is actually w = (300 - 75) / 2 = 112.5 feet.
Hence, for the largest possible cubicle, the length of the shorter side is 112.5 feet, and the length of the longer side is 75 feet.