Question 1
What is the inverse of the matrix $A=\begin{pmatrix}2&0\\0&5\end{pmatrix}$?
Question 2
Is the matrix $B=\begin{pmatrix}1&2\\2&4\end{pmatrix}$ invertible?
Question 3
What is the inverse of the matrix $C=\begin{pmatrix}2&1\\5&3\end{pmatrix}$?
Question 4
What is the inverse of the identity matrix $I_2$?
Question 5
What is the inverse of $A=\begin{pmatrix}1&0\\4&1\end{pmatrix}$?
