Expanding Brackets

Question 1:

7 j+9
7j+63

Question 2:

2 6z7
12z14

Question 3:

5 8b+3
40b+15

Question 4:

k 8k7
8k27k

Question 5:

j 3u+10
3ju+10j

Question 6:

2z 8z+9e
16z2+18ez