exam Maths Puzzle Numerical Ability

This is a worksheet problem.
Thank you!

Suppose the angle of elevation to the top of a tree is 50 degrees. If you are standing 35 feet away from the tree, how tall is the tree?

Thank you so much again!

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exam Other Question

Minimize C=x+y with the following constraints:

0<x<4
0<y<4
2x-3y<-1
-x+y>0

Note: the < signs have a line under
was wandering if any one could help me with this

1/6f-5=1

-36 is this right, thank you for you time.