Answer:
1 is 13
2 is 13
3 is -7
4 is 7
Step-by-step explanation:
This one is very simple.
create a simple equation to find out
15 = 12 + x
subtract 12 from each side
x= 3
the missing number is 3
or, to be even simpler, take the total, subtract the total from the number you know and the difference is the missing number.
hope I helped
ALSO, we can check going down vertically. 3 + 10 =13. this is the total listed at the bottom.
12-x(5-4k)=y
12-y=x(5-4k)
12-y/(5-4k)=x
you have to give us the statements in order to answer your question.