exam Maths Puzzle Numerical Ability

please!

if f(3/x)=2x-1/3

compute

f(x)=?

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exam Other Question

Find the domain of the following:
1a. g(x)=5^x
b. g(x)=ln(x-4)
c. g(t)=log(t+2)
d. f(t)=5.5e^t Solve by completing the square. 2x^2 - 6x - 3 = 0