exam Maths Puzzle Numerical Ability

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

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exam Other Question

Solve absolute value equation and graph the solution set.

2x-8=0
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