exam Maths Puzzle Numerical Ability

Hi Can I have some help finding the inverse function of f.
f(x) = √-6x - 4

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exam Other Question

(-3x)(-y^2z)(-4w^2x3y^5) Simplify. In a class of 30 studnts, there are 17 girls and 13 boys. Five are A students, and three of these students are girls. If a student is chosen at random, what is the probability of choosing a girl and a A student?