A quantity of 84 shingles are required to cover the surface area of 336 square feet of the first roof.
A quantity of 110 shingles are required to cover the surface area of 220 square feet of the second root.
How many shingles and how many area do we need to cover a root?
In this question we must determine both the surface area and the number of shingles to cover two roof configurations as well. In the first case, we calculate the surface area, which is the sum of the area of rectangles:
A = 2 · (8 ft) · (12 ft) + 2 · (6 ft) · (12 ft)
A = 336 ft²
And the number of shingles required to cover the root is:
n = (336 ft²) / (4 ft²)
n = 84
A quantity of 84 shingles are required to cover the surface area of 336 square feet of the first roof.
In the second, we only need to cover the very top surface. The area and the number of shingles are, respectively:
A = 2 · (5 ft) · (22 ft)
A = 220 ft²
n = (220 ft²) / (2 ft²)
n = 110
A quantity of 110 shingles are required to cover the surface area of 220 square feet of the second root.
To learn more on surface areas: https://brainly.com/question/2835293
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