Janelle wrote the matrix addition below.
| 3 -1
6 m-1
17 5+1
nl || -5 0 4] | 1 -6 -7) -1 -7
-9 + 0 -12 2 + 4 0 3 || = 10 12
7| || 1 -18 8] [14 -11 5 32 -28
18
-4
20
Which statement is true?
O (1+4)- 7 = 18
o (m-1)+12)+0 = 12
((5+1)- 18) +11 =-28
o
n+(m-1)+(5+1)=-28