We know three things:
Angle1 = 90 degrees
Angle2 = 28 degrees
Side = 350 ft
So this means, we are dealing with an AAS triangle (angle, angle, side).
To find side x:
X / sin(90degrees) = 350ft / sin(28degrees)
X = (350ft • sin(90degrees)) / sin(28degrees)
X = 745.5...
=746ft
Makes sense? This is how you solve a AAS triangle. I’m not sure if it’s 100% but, good luck!