A quantity of 84 shingles are required to cover the <em>surface</em> area of 336 square feet of the first roof.
A quantity of 110 shingles are required to cover the <em>surface</em> area of 220 square feet of the <em>second</em> root.
<h3>How many shingles and how many area do we need to cover a root?</h3>
In this question we must determine both the <em>surface</em> area and the number of shingles to cover two roof configurations as well. In the first case, we calculate the <em>surface</em> 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 <em>surface</em> 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 <em>surface</em> area of 220 square feet of the <em>second</em> root.
To learn more on surface areas: brainly.com/question/2835293
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