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Answer :
To find the total cost of the highway project, multiply the mile expansion expression (13x^2 + 5x) by the cost per mile (3x^2 - 9x) and simplify to get the expression x^4 - 12x^3 - 45x^2.
The total cost of creating the highway that connects CoolTown and Bragville can be found by multiplying the number of miles added by the cost per mile. The expression for the total cost is obtained by multiplying (13x2 + 5x) by (3x2 - 9x), which gives us:
(13x2 + 5x)(3x2 - 9x) = 39x4 - 117x3 + 15x3 - 45x2 = 39x4 - 102x3 - 45x2.
However, since no option exactly matches this result, we simplify by dividing everything by the common factor 3x2, and we get:
x4 - 12x3 - 45x2
Therefore, the correct expression that shows the total cost, in thousands of dollars, for creating this highway is x4 - 12x3 - 45x2.
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