book Maths Puzzle Numerical Ability

Can you help me find the GCF of this and solve it?:
8d^3 + 4d^2 + 12d

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book Other Question

Solution A is 10% alcohol, solution B is 60% alcohol.How much of each is needed to make 50 liters of a solution that is 30% alcohol? Are the following lines parallel, perpendicular, or neither?

L1 through (-4,-7)and (1,3)
L2 through (2,6) and (4,10)

3/1- -7/-4= 10/5
10/4 - 6/2= 4/2

Is this problem parallel?

Thank you!