Question

Please help me! http://prntscr.com/aew78a

Answer 1

So it's just a right triangle where the shadow is the one leg and the rope is the hypotenuse so you just do the following
\[\sqrt{40^2-30^2}=2645\]

Answer 2

http://prntscr.com/aewbdc
But that has no solution...

Answer 3

40^2 = 30^2 + x^2 by Pythagorean Theorem