Answer:
So you need to solve for x and y so to find x and y you do -3+3 and that would get you to -1 so that would mean that y=3 and x=2 because 3+2+-1=4 then in the second problem thing it would be x+y to get 3 i hope that this makes sence now. :)
Step-by-step explanation:
450 feet below sea level
It’s C
5040 different combinations
0-9 = 10 numbers
1st digit can be 1 0f 10
2nd digit can be 1 of 9
3rd digit can be 1 of 8
4th digit can be 1 of 7
10×9×8×7=5040
