If the side of each square is 7 inches, then the area of one square is 7^2 = <<7^2=49>>49 square inches.
If Robert wants to use 10 squares, the total area used by the squares is 10 * 49 = <<10*49=490>>490 square inches.
Therefore, he will have 720 - 490 = <<720-490=230>>230 square inches left for his presentation when s = 7. Answer: \boxed{230}.
Robert is preparing a poster board presentation. He wants to decorative pattern with 10 squares to fill part of the poster. The area of the poster board is 720. How much space Robert will have left for his presentation? If he uses squares with 7 inch sides, evaluate 720 − 10s² when = 7.
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