If you are trying to figure out the distance between the top of the tree and the end of the shadow, use a^2 + b^2 = c^2 where c is the hypotenuse and a and b are the legs of the right triangle.
5^2 + 4^2 = c^2
25 + 16 = c^2
41 = c^2
c = √41 = 6.4 meters
$8.75 is the answer.
You divide 26.25 by 3.
Its 436486 because you don't need to round it up
Some of the fertilizer can run off into streams and can harm fish and get in the streams