exam Maths Puzzle Numerical Ability

((3xy(-2 power) z))to the -2power / ((4x(-2power)y)) to the -2 power

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exam Other Question

f(x) = -0.019x^2 + 3.04x - 58.87 describes newspaper circulation (in millions) in the US for 1920-1998 (x = 20 for 1920). When did the circulation approximate 45 million? Correct Question :"
Let a and b be distict real numbers for which
a/b + (a+10b) / (b+10a) = 2
The value of a/b is
a) .5 b) .6 c) .8 d) 1 or .8