12. I need the graphs to answer it
11. y = 1/2x - 1
10. The first graph is the best
Add 48, 38, and 12 together to get your answer
Proofs are... well... just that. They are your proof for why a certain property works or what you did to show your work. So essentially, you just do math like normal, a proof is showing what you did and why it works.