exam Maths Puzzle Numerical Ability

The length of a golden retangle is approximately 1.6 times the width. Find the dimensions of a golden rectangle if its area is 9000m^2.

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Please help me with this question:

What is the equation of a line, g(x), that is perpendicular to f(x)=1/2x+2 and passes through (0,2)?

a) g(x)=-4x+2
b) g(x)=-4x-2
c) g(x)=-4x-8
d) g(x) can not be determined with this information So when you have a fraction, it is always rational because the two numbers on top are both integers. Right?