exam Maths Puzzle Numerical Ability

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2^-2a^-3/c * (2a^3c - 8a^3/c^2)

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exam Other Question

If a gallon (gal) of water weighs 8.34 pounds (lb), how much does 3.75 gal weigh?
a) 15 lb b) 31.275 lb c) 30.125 lb d) 12.09 lb

Thank you very much
Show all stages of factoring separately (i.e., show the result of factoring out a GCF before taking the resulting polynomial and factoring it again).

Factor completely:
x3 - 26x2 + 48x