exam Maths Puzzle Numerical Ability

Hi. I'm having some trouble finding the vertex of this function. Can you help me?

y = 8x^2 + 5x

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exam Other Question

A certain real-estate agent receives $6 for every &100 of a houses selling price. How much was the house sold for if the agent receives $10,725? find three consecutive integers such that 5 times the sum of the first and third is 14 greater than 8 times the second.