What is the the union for the following sets.

X = {0, 10, 100, 1000}

Y = {100, 1000}

X ∪ Y =

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

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?

Maurice has 54 fewer comic books than rebecca.they have 130 comic books together .how many comic books are in maurices collection ? how many comic books are in rebeccas collection