Answer
520 ft
Work Step by Step
Express the given information as a ratio.
$\frac{x}{80}=\frac{13}{2}$$\Rightarrow$use cross products to solve for x
$2x=13\times80$$\Rightarrow$multiply
$2x=1040$$\Rightarrow$multiplication property of equality
$2x\div2=1040\div2$$\Rightarrow$divide
$x=520$
