exam Maths Puzzle Numerical Ability

I am stuck on correct answer for:

(3 X 10^2) X (2 X 10-3)=:

The 10-3 is actually (10 to negative 3rd power) but I can't show that correctly in email.

I am not using a spec

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How do you put 2n^2-4n-6=0 in to a graph or table . Round to the nearst tenth f(x) = x^2-x-2; find (a) f(0) (b) f(-2) and (c) f(1)