Alex subtracted two fractions as follows. Examine his work. 54 - 3
,
1
Step 1: 549
387
Step 2:55
3
56
63
3
2
Step 3:5
20
56
Step 4;
63
36
63
Step 5: 535 - 35= 2
What mistake, if any, did he make?

Which lines are parallel? justify your answer. lines p and q are parallel because same side interior angles are congruent. lines p and q are parallel because alternate exterior angles are congruent lines l and m are parallel because same side interior angles are supplementary lines l and m are parallel because alternate interior angles are supplementary.