exam Maths Puzzle Numerical Ability

Simplify the expression 13[6 to the 2nd power divided by (5to the 2nd power minus 4 to the 2nd power) +9]

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exam Other Question

What are the coordinates of the apex of:

(f*g)(x) if f(x)=x^2+4 and g(x)=x-3 For this question, we must find the revenue from the sale of x items given by R=50x. Does this ask to graph the equation only or do I need to solve this for x. And if so, how do I do it?