exam Maths Puzzle Numerical Ability

y^2-2x^2+6y+4x=9

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exam Other Question

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
use the formula I=prt to find the principal.
If the interest (I) earned on $60 for 1 year(t) on a 12% (r) investment.