To find out how much space Robert will have left for his presentation after using squares with 7-inch sides, we first calculate the area of one square and then the total area of the 10 squares.
-
The area \(s^2\) of one square with side length \(s = 7\) inches is: \[ s^2 = 7^2 = 49 \text{ square inches} \]
-
The area of 10 squares is: \[ 10s^2 = 10 \times 49 = 490 \text{ square inches} \]
-
Now, we can find the space left on the poster board by evaluating: \[ 720 - 10s^2 = 720 - 490 \] \[ 720 - 490 = 230 \text{ square inches} \]
Thus, the space Robert will have left for his presentation is 230 square inches.
1 answer