Answer
$F_{net}=307N$
Work Step by Step
The magnitude of net force is given as
$F_{net}=\sqrt{F_x^2+F_y^2}$
We plugin the known values $F_x=285N$ and $F_y=-115N$ to obtain:
$F_{net}=\sqrt{(285)^2+(-115)^2}$
$F_{net}=307N$
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