The distance from the top of a tower to a point on the ground located 30 meters from the base of the tower is 5 meters more than twice the height of the tower. How high os the tower to the nearest meter?
let height of tower is x
then by Pythagoras therom
(5+x)^2 = x^2 + (30)^2
25+x^2+10x= x^2 + 900
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