Answer:
9
Step-by-step explanation:
the two lines on either sign of each number indicate absolute value, which is the numbers value from 0 (on a number line). You turn -12 and -3 into 12 and 3 and subtract as normal.
Therefore, the correct answer is:
A
20 x 2 = 40
30 x 2 = 60
Thank you.!..................