Robert is preparing a poster-board presentation. He wants to make a decorative pattern with 10 squares to fill part of the poster. The area of the poster board is 720 square inches. To find how much space Robert will have left for his presentation if he uses squares with 7-inch sides, evaluate 720 - 10s2 when s = 7.
Options:
580 square inches
9,840 square inches
33,790 square inches
230 square inches
To find out how much space Robert will have left for his presentation, we need to calculate the total area of the 10 squares and subtract that from the total area of the poster board.
The area of one square with a side length of 7 inches is s^2 = 7^2 = 49 square inches.
The total area of the 10 squares is 10 * 49 = 490 square inches.
To find out how much space Robert will have left for his presentation, we subtract the area of the 10 squares from the total area of the poster board: 720 - 490 = 230 square inches.
So, Robert will have 230 square inches left for his presentation. The correct option is 230 square inches.