To compute row reductions, feel free to use numerical applets such as this one from Georgia Tech, but make sure to state which row operations you have done, and to write the resulting matrix of each row operation.

Section 4.2: 9, 11, 16

Section 4.3: 1(b,d,f), 3(b,d), 6, 7, 24

Section 4.4: 2(c,d,f), 12, 16, 22, 23