exam Maths Puzzle Numerical Ability

What is the domain of y=logbase5(x-8)? I think the answer is x is greater than 5 ???????

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exam Other Question

For the function f(x)= -3x^2 + x- 11, determine the difference quotient
f(a+h) - f(a)/h where h is not equal to 0. Simplify your result as much as possible. A solution containing 30% insecticide is to be mixed with a solution containing 50% insecticide to make 200 L of a solutions containing 42% insecticide. How much of each solution should be used?