To find out how much space Robert will have left for his presentation after using the squares, we first need to calculate the total area occupied by the 10 squares with 7-inch sides.
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Calculate the area of one square: \[ s = 7 , \text{inches} \] \[ \text{Area of one square} = s^2 = 7^2 = 49 , \text{square inches} \]
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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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Calculate the remaining area on the poster board: \[ \text{Area of the poster board} = 720 , \text{square inches} \] \[ \text{Remaining area} = 720 - 490 = 230 , \text{square inches} \]
Alternatively, as per the expression given \( 720 - 10s^2 \):
\[ 720 - 10s^2 = 720 - 10(7^2) = 720 - 10(49) = 720 - 490 = 230 , \text{square inches} \]
Thus, the space Robert will have left for his presentation is 230 square inches.
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