exam Maths Puzzle Numerical Ability

i dont get this problem ? x(squared)+9 is less than or equal to zero

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exam Other Question

The first angle of a triangle is 15 degrees more than the second triangle. The third angle of a triangle is three times the second angle. Use x to represent the unknown Value.

? The first angle
? the second angle
? the third angle
I hope I am in the right section but I am completly loss with this.

If f(x)=x(x-1)(x-4)^2, use interval notation to give all values of x where f(x)>0.

a. (-infinity,0)U(4,inf