Answer:
A
Step-by-step explanation:
40+6=12
12*X=645
697+645=12500
then,
X=5 and 8
Option 2.)
(Please correct me if I'm wrong)
Multiplying positive numbers always comes out positive, no matter how many there are. So you can forget about the positive ones.
Every two negative numbers in a multiplication produce a positive.
Another way to say that is: If the number of negative ones is EVEN,
the answer is positive, and if it's ODD, the answer is negative.
That monster product of eight numbers in problem #12 will be negative,
because there are an odd amount of negative factors in it.
