exam Maths Puzzle Numerical Ability

2) -3/8 ≤ -1/4x + 1/8 < 5/8

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exam Other Question

I need to factor x2-6x-16=0. What I have is (x-4),(x-4) or (x-2), (x-8) as my answers. I am having a hard time looking at the example in my book vs. what my teacher gave us for our assignment. Pleas help me with this problem.
Roy has 8 gallons of 40% antifreeze solution. How much 100% antifreeze mus be added to make a solution that is at least 60% antifreeze.

Thanks =)