Question

help!!

Answer 1

wow, complicated question

Answer 2

18 i do believe that is correct

Answer 3

its either 18 or its 20

Answer 4

17

Answer 5

damn im sorry

Answer 6

everyone can make a mistake :)

Answer 7

yeah

Answer 8

here you have to minimize the length of the segment AD+DE, namley you have to minimize this function:
\[\Large d\left( x \right) = \sqrt {{{\left( {15 - x} \right)}^2} + {5^2}} + \sqrt {{x^2} + {3^2}} \]

Please note that I have applied the theorem of Pitagorqa to the triangles ABD and ECD