Expanding Brackets

Question 1:

7 z10
7z70

Question 2:

8 2f+9
16f+72

Question 3:

10 5p6
50p60

Question 4:

s 3s+7
3s2+7s

Question 5:

t 7g+3
7gt+3t

Question 6:

8t 5t7c
40t256ct