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a = k/b when a is inversely proportional to b, where k is a constant.
a is directly proportinal or inversely proportional to b
To determine if mulch that costs a set amount to cover a square foot is proportional, you need to consider the relationship between the cost and the area covered. If the cost remains constant regardless of the area covered, then it is proportional. For example, if $1 covers 1 square foot, $2 covers 2 square feet, and so on, then it is proportional. However, if the cost changes based on the area covered, then it is not proportional.
Change in area = (change in sides)2
No because the formula for finding the area of an oval, which is an ellipse, is quite different