exam Maths Puzzle Numerical Ability

Determine where the function is increasing and where it is decreasing.
f(x) = 4x^2 - x - 3

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exam Other Question

To find the distance to the nearest hundredth between the points (-6-5) and (-1,3) do I start by using -6 and -1 as my X and -5 and 3 as my y?
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In the figure above, FD||AC and EF||CB. Prove that angle C is congruent to angle EFD and that angle CEF is congruent to angle FDC.