Given that,
The shape of a dome can be modeled by the equation :
[tex]h=2d^2+100[/tex] ....(1)
h is the height of the dome
d is distance from its center
We need to find the distance from the center of the dome if the height is 50 feet. Put h = 50 in equation (1)
[tex]50=2d^2+100\\\\2d^2=100-50\\\\2d^2=50\\\\d^2=25\\\\d=5\ \text{feet}[/tex], neglecting d = -5 feet (as height can't be negative)
So, at a distance of 5 feet from the center of domes the height is 50 feet.