1.2

10*

18*

a. no, look at the 3d column.

b. yes

c. no. the 3d row has a leading 1 but the 2d row does not.

d. yes.

24*

Suppose matrix A is equivalent to matrix B.

If B is obtained from A by row swapping, then A can be obtained from B by row swapping.

If B is obtained from A by multiplying a row by a non zero scalar then A can be obtained from B by dividing the row by the same scalar.