Find angle 4 if angle 1=3x+66, then angle 2=angle 3, and angle 3=4x-40

How do you use the elimination method for this question? explain, because i really want to understand!

Sandy is ordering bread rolls for her party, she wants 3/5 of the rolls to be whole wheat. what other factions can represent part of the rolls that will be whole wheat? shade the models to show your work.

What is the effect on the graph of the function f(x)=x when f(x) is replaced with -f(x)+4