Answer :

charstar
1. I don't what it means by models sorry.
2.
a) gcf of 4d and 12e is 4
    4(d+3)
b) gcf of 18x and 30y is 6
    6(3x+5y)
c) gcf of 21a and 28y is 7
    7(3a+4y)
d) gcf of 24f and 56g is 8
    8(3f+7g)

Hope this helps :)

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