Answer
42,900 $mi^{2}$
Work Step by Step
We use the formula for the area of a trapezoid to obtain:
A=$\frac{1}{2}$h($b_{1}$+$b_{2}$)
A=$\frac{1}{2}$(10)(340+440)
A=$\frac{1}{2}$(110)(780)
A=42,900
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