Answer the following.

factor the following expression using the gcf: 2dr – 4r.

r(2d – 4)
2r(d – 2)
2(dr – 2r)
2r(d – 1)

factor the following expression using the gcf: 14xy + 8yz.

2(7xy + 4yz)
2xy(7 + 4z)
y(14x + 8z)
2y(7x + 4z)

factor the following expression using the gcf: 10ab + 20.

10(ab + 2)
5(2ab + 4)
2(5ab + 10)
10(ab + 20)

factor the following expression using the gcf: 42pr – 3p.

3p(14r)
p(42r – 3)
3p(14r – 1)
42p(r – 3)