exam Maths Puzzle Numerical Ability

Can someone please help me answer this question?
The vertex of the graph of the quadratic function f(x)= -2^2+7x-3 is
My answer options are:
A. ((4/70,f(4/7))
B. ((-4/7),f(-4/7

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exam Other Question
Should the triangle be solved beginning with Law of Sines or Law of cosines. Then solve the triangle and round to the nearest tenth. a=16,b=13,c=10 You are to estimate the measure of the angle created by the hour and minute hands on the clocks and classify the angle as being acute, straight, right or obtuse:

8:10 Estimate: