exam Maths Puzzle Numerical Ability

Can I have some help with functions?

If g(x) = x^2 + 4x with x ≥ -2, find g ^-1(-3)

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exam Other Question

Solve the logarithmic equation log x + log (x-3)= 1 how do you do this?There are 30 students in a class, and three-fifths of them are girls. How many
boys are in the class??