For the expression

, the coefficient of the x² term is 1.
Answer:
the measure of the missing length is 3 mi
Step-by-step explanation:
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The answer would be 8+14 because there are 4 sides not 2
D. The answer has to be 2,000, eliminating A and C. B doesn't even use the original equation, as well as incorrectly solving the method, so D is the correct answer, even if you don't understand the principles.