To find out how much space Ruber will have left for his presentation after using 10 squares with 7-inch sides, we can start by calculating the area of one square and then the total area for 10 squares.
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Calculate the area of one square: \[ \text{Area of one square} = s^2 \] For \( s = 7 \): \[ \text{Area of one square} = 7^2 = 49 , \text{square inches} \]
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Calculate the total area of 10 squares: \[ \text{Total area of 10 squares} = 10 \times 49 = 490 , \text{square inches} \]
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Now, find the area remaining on the poster board: The total area of the poster board is 720 square inches. We can find the remaining area by subtracting the area used by the squares from the total area of the poster board. \[ \text{Remaining area} = 720 - 490 = 230 , \text{square inches} \]
Thus, Rubber will have 230 square inches of space left for his presentation after using the squares.
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