exam Maths Puzzle Numerical Ability

Please help, seems too simple and it feels like a trap???

Q: Which of the following is a logarithmic function? Which an exponential function?

f(x)=x^2
L(t)=1-e^-t
g(q)=q^-2
R(x)=4ln(x)

Thank you for your help
Shelly

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exam Other Question
(-27x^9)^⅓ The approximate distance above sea level,d, in kilometres, is given by the formula d= (400(log(P/2)-2.5))/30, where P is the barametric pressure in kilopascals(kPa). What is the barometric pressure 12 kilometres above sea level? PLEASE HELP ME :)