Answer:
21
Step-by-step explanation:
9-(-12) = 9+12 = 21 ( product of two minus signs is plus)
Answer:
11
Step-by-step explanation:
Okay so this used to confuse me when I was younger but It's actually pretty simple, just imagine the subtraction sign, the parentheses, and the negative sign in front of the two turns into a plus sign. It's basically addition with more steps so instead of seeing this - ( - you can see this +. I hope this helps.
