Mathematics, 05.05.2020 05:38, maddie7417

A state department of public safety added 13x2 + 5x miles of highway to connect CoolTown and Bragville. It cost the department 3x2 – 9x thousand dollars to complete each mile of interstate. Which expression shows the total cost, in thousands of dollars, of creating this highway?

A) x4 + 12x3 – 45x2
B) x4 – 45x2
C) x4 + 15x3 – 48x2
D) 9x4 – 12x3 – 45x2

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