The computation shows that the square feet that the company will need in 7 hours is 353 feet².
From the information, the tiling company uses the function f(t) = -t2 + 28t + 108 to determine how many square feet of tile can be installed in t hours.
In 7 hours, the square feet will be:
= -t² + 28t + 108
= -(7)² + (28 × 7) + 108
= 49 + 196 + 108
= 353 feet²
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