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Algebra
Question

Janelle wrote the matrix addition below. \( \left ...

Janelle wrote the matrix addition below. 

\( \left [ \begin{array} { c c c } { 3 } & { - 1 } & { n } \\ { 6 } & { m - 1 } & { - 9 } \\ { 17 } & { s + 1 } & { 7 } \end{array} \right ] + ( \left [ \begin{array} { r r r } { - 5 } & { 0 } & { 4 } \\ { 0 } & { - 12 } & { 2 } \\ { 1 } & { - 18 } & { 8 } \end{array} \right ] + \left [ \begin{array} { r r r } { 1 } & { - 6 } & { - 7 } \\ { 4 } & { 0 } & { 3 } \\ { 14 } & { - 11 } & { 5 } \end{array} \right ] = \left [ \begin{array} { r r r } { - 1 } & { - 7 } & { 18 } \\ { 10 } & { 12 } & { - 4 } \\ { 32 } & { - 28 } & { 20 } \end{array} \right ] \) 

Which statement is true? 

\(\circ \)\( ( n + 4 ) - 7 = 18 \) 

\(\circ \)\( ( ( m - 1 ) + 12 ) + 1 ] = 12 \) 

\(\circ \)\( ( ( s + 1 ) - 18 ) + 11 = - 28 \) 

\(\circ \)\( n + ( m - 1 ) + ( s + 1 ) = - 28\) 

Answer

The first option  is true

Solution
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