To find out how much space Robert will have left for his presentation after using the 10 squares, we need to evaluate the expression \( 720 - 10s^2 \) when \( s = 7 \).
First, calculate \( s^2 \):
\[ s^2 = 7^2 = 49 \]
Next, multiply \( s^2 \) by 10 to find the total area occupied by the 10 squares:
\[ 10s^2 = 10 \times 49 = 490 \]
Now, subtract this area from the total area of the poster board:
\[ 720 - 490 = 230 \]
Therefore, the space Robert will have left for his presentation is 230 square inches.
The correct response is:
230 square inches
1 answer