exam Maths Puzzle Numerical Ability

I need to find out what is the natural logarithem and examples?

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exam Other Question

1. a) If k(x)= -f(x) what would the new coordinates of P (which were 0,-1) be after the reflection? Give answer in (x, y) form.

Answer:

b) Consider the function f(x)x The arithmetic sequence x,2x-20,3x-28,... has D1=-16. What is the formula for the nth term ?
I said tn= -16+12 but was marked wrong :(