Hi!
1.)
a:A u B=

(The same elements are written once.)
b:A u C

c:B u C

Note:I used dots to mean commas .
Good work!
Your question does not give enough information for me to answer
I believe the school is 35.2 ft. tall. call me out if I'm wrong.
Well what's in the deck for example 3 red cards 2 yellow cards and a green card
X=<span><span><span>43</span>y</span>+<span><span>−4</span><span>3 hope this helped</span></span></span>