Hi! I'm really bad at math, I was wondering if anyone could help me slove these problems and explain how you got the answer? Maybe put it in the simplest way to say it, I can get confused easily, Thank You <3

Find the value of the expression
12²

Evaluate
( 8/9²

Simplify the expression
(3²-2³) ÷2

Evaluate the following for x=5 and y=3
Y³ - 4x

Evaluate the expression for x=2 and y=5
3y-5
X