exam Maths Puzzle Numerical Ability

What is the domain of the following:
f(t)= log(t-5)
g(x)=5e^x
g(t)=ln(t+4)
g(t)=5^t

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exam Other Question

I need help to perform the indicated operation

f(x)=4x2+5x+7, g(x)=5x-3

I need to find (g of)(x) How do multiply this rational expression: a^2-9/a^2*a^2-3a/a^2+2-12? Whats the answer?