A plate glass window measures 5 ft by 7 ft. If glass costs $7 per square foot, how much will it cost to replace the window.
A = 5 * 7
A = 35 sq. ft.
35 * 7 = ?
To calculate the cost of replacing the window, we need to find the area of the window and then multiply it by the cost per square foot.
First, let's calculate the area of the window by multiplying its length and width:
Area = Length x Width
Given that the length of the window is 5 ft and the width is 7 ft, we can substitute these values into the formula:
Area = 5 ft x 7 ft
Area = 35 square feet
Now that we know the area of the window is 35 square feet, we can calculate the cost to replace it by multiplying the area by the cost per square foot:
Cost = Area x Cost per Square Foot
Given that the cost per square foot is $7, we can substitute these values into the formula:
Cost = 35 square feet x $7 per square foot
Finally, we can multiply the area and the cost per square foot to get the total cost:
Cost = 35 square feet x $7 per square foot
Cost = $245
Therefore, it will cost $245 to replace the window.