Answer:
9
Step-by-step explanation:
Assuming x is the multiplication symbol, you would multiply 3 and the other 3 together. This leaves you with 9+7-7. Since 7-7=0 you can just get rid of both sevens completely. Now you are only left with 9.
Answer:
392.1
Step-by-step explanation: just divide and round
Answer:
12 x 12 = 144, 12 x 13 = 156
Step-by-step explanation: