Robert is preparing a poster board to 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
To find how much space Robert will have left for his presentation, we need to subtract the total area of the squares from the area of the poster board. The area of one square is s^2, so the area of 10 squares is 10 * s^2.
Since s = 7, the area of 10 squares is 10 * 7^2 = 10 * 49 = 490 square inches.
Now we can subtract this area from the area of the poster board: 720 - 490 = 230 square inches.
Therefore, Robert will have 230 square inches left for his presentation. Answer: \boxed{230}.
Mr. Rodirguenz has a vegetable garden that borders his house. he wants to put a fence around it. it $7 per yard for the materials. Evaluate 7 (l + 2w), where l is the length and w is the width of his garden, to find the cost for a garden that has a length of 5 yards and a width of 2 yards.
To find the cost of the fence materials, we need to calculate the perimeter of the garden, which is 2 times the length plus 2 times the width.
Given the length l = 5 yards and the width w = 2 yards, the perimeter is given by:
Perimeter = 2l + 2w = 2(5) + 2(2) = 10 + 4 = 14 yards.
To find the cost, we multiply the perimeter by the cost per yard:
Cost = 7 (per yard) × Perimeter = 7 × 14 = 98 dollars.
Therefore, the cost for a garden with a length of 5 yards and a width of 2 yards is $98. Answer: \boxed{98}.