Answer: $13200
Step-by-step explanation:
If 100 square feet of roofing is installed for a cost of $1,200
1,100 square feet would cost $Z (let the unknown cost be Z)
i.e 100 ft^2 = $1,200
1100 ft^2 = $Z
Hence, to get the value of Z, cross multiply
Z x 100 = 1200 x 1100
100Z = 130000
Divide both sides by Z
100Z/100 = 1320000/100
Z = $13200
Thus, $13200 is the cost to have 1,100 square feet of roofing sheet installed
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The drawing will explain all that you need yo answer this question. Note, you do have to use Pythagorean theorem. You can do what I drew because of a theorem that states if a segment is perpendicular to a chord then that segment bisects the chord.