exam Maths Puzzle Numerical Ability

Find (f o g)(16) if f(x)=3^x and f(x)=log4(x)

I got this far
g(16)=log4(16)=4

Please help.Thanks

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exam Other Question

I am lost please help. thanks

1. graph f(x) = log2x + 3

2. graph f(x) = log2(x - 6) (c^+3c-4)-(5c^+3c-1) please help me solve and simplify. Also, (x+4)(x^-3x+7)