exam Maths Puzzle Numerical Ability

I need help to perform the indicated operation

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

I need to find (g of)(x)

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exam Other Question

Please help me with this problem: A five-pointed star is inscribed in an irrergular pentagon, how do I find the formula for the sum of it's angles? I tried drawing it in the regula 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