The distance from x=-12 to x=6 on the horizontal line y=-3 is
.. 6 -(-12) = 18 units
Since each unit represents 1 mile, the road is 18 miles long.
4.25(15)+4.25(1.5)(7)+0.21(1345)=
63.75+44.625+282.45=$390.825
=$390.83
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