exam Maths Puzzle Numerical Ability

What is 1/3log(8A)^3 + 1/2logB-9logC expressed as a single log ?

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exam Other Question

Divide:
x^2 - 9x + 20
--------
6x - 4

÷

x^2 - 25
-----------
2x + 10

÷
I know this may not be the right type of topic for the question but I guessed what i thought was close.

let f(x) = -3x and g(x) = x-4. find (FoG)(-5)
a. 27
b. 11
c. -135
d. -45