ElectricPavlov

                          6                    

 7 sqrt5  + 15 sqrt5  + 12 sqrt5

                          6                   

                  34 sqrt 5

3* sqrt5/85  

101/500  =  .202

y = 1/3 x +4     slope , m , = 1/3   perpindicular slope  = - 1/m = -3

(y-8) = -3 (x-5)                re-arrange to any form you want

sin x = - 0.73   between 0 and 360^o

arcsin ( - 0.73) =   313.11^o   and    226.89^o

The 'x' coordinate will be   - b/2a   =  - -64/16 = 4

the 'y' coordinate will be       8 ( 4)^2  - 64(4) = -128     ( found by substituting '4' into the equation for 'x')

Slope = 1/4     (both lines)

y = 1/4 x + b     sub in the given point ot calc 'b'

3 = 1/4 ( -8) + b

 b = 5

y = 1/4 x + 5

8 x 10 x 10 x 9 x 9 x 10 x 10 x 10 x 10 = ........

Wow....that is not even a SLIGHT typo!   .

  Thanx Guest ! 

****   Way off base....see answer below *****  

Definitely easier!