book Maths Puzzle Numerical Ability

(6xy^2/7y^3)/(15x^2y/5x^2)

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book Other Question

ok I need to graph and get the intercepts for the problem y = -4x^2 +16x - 12 I know its a downward cone shape but I cannot get the vertex or the intercepts right. plot the graph of the following function and what is the range:

y=5/x, domain = {x: 0.4 less than or equal to x less than or equal to 10}