Our brownie recipe calls for a 9 x 13 inch pan, but our pans are worn down so that we can only see one number on the label. We know that the area is 117 inches2 and that one side of the pan is 9 inches. The formula for the area of a rectangle is A=LW, where L=length and W=width. What would our formula for area look like using an algebraic symbol for the unknown side? What is the length of the unknown side of the pan?
Tuesday, November 4, 2008
We Need New Pans
Our brownie recipe calls for a 9 x 13 inch pan, but our pans are worn down so that we can only see one number on the label. We know that the area is 117 inches2 and that one side of the pan is 9 inches. The formula for the area of a rectangle is A=LW, where L=length and W=width. What would our formula for area look like using an algebraic symbol for the unknown side? What is the length of the unknown side of the pan?
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