exam Maths Puzzle Numerical Ability

I am stuck on this question

58.3% of driver`s license exams resulted in a passing mark. If the records show that 8370 new drivers licenses were issued, how many applicants were there?

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exam Other Question

if f(x) = 5x-1 then find the following f(a-2)

i am so lost on where to begin with this, thank you for the help i need to factorize x^2 + 1 /x^2 +2 -2x - 2/x , i need urgent help in this please i did this sum but the answers coming wrong . thanks