Use the associative property to write am expression equivalent to (n+3) +4 Which expression is equivalent to (n + 3) + 4 using the associaguve property?

n + 3 + 4

n + (3+4)

(n + 4) + 3

4 + (n + 3)

Astick 2 m long is placed vertically at point b. the top of the stick is in line with the top of a tree as seen from point a, which is 3 m from the stick and 30 m from the tree. how tall is the tree?