Find the determinant of
\n\\begin{bmatrix}\\var{n11}&\\var{n12}&\\var{n13}\\\\ \\var{n21}&\\var{n22}&\\var{n23}\\\\ \\var{n31} & \\var{n32} & \\var{n33}\\end{bmatrix}
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", "advice": "To find the determinant of \\begin{bmatrix}1 & 2 & 0 \\\\ 2& -1 & 1 \\\\ 1 & -1 & 1 \\end{bmatrix} if we use the first row,
\n\n$1 \\begin{vmatrix} -1&1\\\\ -1 &1\\end{vmatrix} -1 \\begin{vmatrix}2 & 1\\\\ 1 &1\\end{vmatrix} + 0 \\begin{vmatrix} 2&-1\\\\ 1& -1\\end{vmatrix}$
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", "advice": "Each day, Chris eats {num_apples} apples. There are 7 days in a week.
\n\nTo find the number of apples Chris eats each week, multiply {num_apples} by 7.
\n\nChris eats {7*num_apples} apples per week.
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