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To calculate how much space Robert will have left for his presentation after using squares with 7-inch sides, we need to substitute the value of s=7 into the expression 720 - 10s^2.
First, calculate the area of one square:
s^2 = 7^2 = 49 square inches
Since Robert is using 10 squares:
10 * s^2 = 10 * 49 = 490 square inches
Now subtract the area occupied by the squares from the total area of the poster:
720 - 10s^2 = 720 - 490 = 230 square inches
So Robert will have 230 square inches of space left on his poster-board presentation.