To determine the space Robert will have left after using the squares, we can follow these steps:
-
Calculate the area of one square with a side length of 7 inches. \[ \text{Area of one square} = s^2 = 7^2 = 49 \text{ square inches} \]
-
Calculate the total area of the 10 squares. \[ \text{Total area of 10 squares} = 10 \times 49 = 490 \text{ square inches} \]
-
Now, subtract the area occupied by the squares from the total area of the poster board to obtain the remaining space. \[ \text{Remaining area} = \text{Total area of poster} - \text{Total area of squares} \] \[ \text{Remaining area} = 720 - 490 = 230 \text{ square inches} \]
Thus, after using squares with 7-inch sides, Robert will have 230 square inches of space left for his presentation.