Answer
$y=160.86~ft$
Work Step by Step
Let the distance from the base of the tower to the guy (side adjacent to $θ$) be $y$:
$tan~θ=\frac{opp}{adj}$
$tan~43°=\frac{150}{y}$
$y=\frac{150}{tan~43°}$ (Use a calculator to evaluate $tan~43°$)
$y=160.86$
