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For this question, the inequality is 4.9+4.1+6.4.+x < 18.7 and the solution is x < 3.3 ft.
The perimeter of a geometric figure is the sum of its sides. Thus, for a square, for example, the perimeter is S1+S2+S3+S4, where S represents the dimension of each side.
In this question the sides are: 4.9, 4.1, 6.4 and x. The exercise also informs that the perimeter is less than 18.7 ft.
Thus, you can write
4.9+4.1+6.4.+x < 18.7
x+15.4 < 18.7
x < 18.7 - 15.4
x < 3.3 ft.
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