exam Maths Puzzle Numerical Ability

I need to evaluate the function at the given expression, I need to find f (k-1) when f (x)=3x2-5x-4

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exam Other Question
Show that the volume of a right circular cone with height [h] and base radius [r] is [(1/3)pi x r^2 x h] the problem i that I need help is the following:
-2 7/10 / (-1 1/14)