Find each sum.
1. 56+ (-56)

0

Step-by-step explanation:

Find each sum.

1.  56+ (-56) = 0

The number series 1, 2, 3, 4, 55, 56. Therefore, 1596 is the sum of positive integers.

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.