Question 829941
The given equation is:   {{{y^2 = x^2 + 12^2}}}

    If x = 25ft,
                         {{{y^2 = (25)^2 + (12)^2}}}
                         {{{y^2 = 625 + 144}}}
                         {{{y^2 = 769}}}
                         {{{y = sqrt(769)}}}
                         {{{y = 27.7 ft}}}
 
You can round up like this: {{{y = 28 ft}}}