Note: I didn't solve all of them, but hopefully this still helps.
4.
h*b = b*h because of the commutative property. for example if h= 3 and b = 5, 5*3 = 15 = 3*5
2.
a) 2x + 20
b) 5x + 5
c) 10x + 20
d) 72 + 36y
e) 64 + 72
f) 35y + 30
5.
a) 10x + 10y + 10
b) 12x + 20y + 4
c) 56x + 24y + 16
Goodluck with your schoolwork/homework!
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Apologies in advance for any errors or bad explanations.