Solution: Total sum is $5 \times 22 = 110$. Sum of known values: $20 + 21 + 23 + 24 = 88$. The fifth value is $110 - 88 = 22$. \boxed22Question: Find the matrix $\mathbfM$ such that $\mathbfM \beginpmatrix 1 \\ 0 \endpmatrix = \beginpmatrix 2 \\ -1 \endpmatrix$ and $\mathbfM \beginpmatrix 0 \\ 1 \endpmatrix = \beginpmatrix 3 \\ 4 \endpmatrix$. - Abu Waleed Tea