exam Maths Puzzle Numerical Ability

in selecting a piece of angle iron for a certain applicatioin, you know that you must have no more cross-sectional area than 60 squared cm , else the angle iron will weigh too much

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exam Other Question

Find the product of these two matrices
[1 4 1] }
[3 -6 2] }[4 1] the first two are part of the same matrix Can you help me evaluate this function?

f(x) = -x^2 + 5 for 4 = x

I get four different answers -9, -10, -11, -12

Which is right, and how do get it?

Please help me,
Ellen