exam Maths Puzzle Numerical Ability

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

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How do I find the product of the following and what is the product?

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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?