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9th grade algebra 1A class: please factor each of these expressions using GCF:
25x^{4}y^{5} - 75x^{3}y^{4]
2x(x+4) + 11(x+4)
72x^{3} - 42x^{2} + 22x
4bd-6bf
-84x^{5} - 42x^{3} - 91x^{2}
8wy - 0.2ay
12x^{3} - 18x^{2} + 24x
5x(x+4) - 10(x+4)
also please find the product of 2x - 1 and (-4x^{2} +2x - 7)