exam Maths Puzzle Numerical Ability

Which intervals are decreasing?
f(x) = x^3 – 12 x^2 + 36x + 1
I came up with (-6, -2), is this correct?

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Also, I am trying to find t

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exam Other Question

Can someone help me on this problem?

I need to solve:
3x/7 - 5x/3 = 2/21

Thanks,
Sher
Please help me with this problem:
Let f(x)=ln(x^2) for x > 0 and g(x)=e^(2x) for x is greater than or equal to 0. Let H be the composition of f with g, that is, H(x)=f(g(x)), and