exam Maths Puzzle Numerical Ability

Convert the numeral 1011 base 2 to a common base 10 number

A. 3
B. 5
C. 11
D. None of the above

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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. A chemist has a 25% and a 50% acid solution. How much of each solution should be used to form 200 mL of a 35% acid solution?