You can put this solution on YOUR website!
---Step#1: Draw the problem out to visualize.
You should draw a right-triangle.
The slant of the triangle is the guy-wire = 50ft.
The base of the antenna to the guy-wire on the ground is say "x"
The height of the antenna is 10 feet larger than the distance from the base of the antenna to the point where the guy wire is attached to the ground = (x+10)
a = x
b = (a+10)
c = 50
Once you have x, length of antenna is x+10