book Maths Puzzle Numerical Ability

What is the answer to An 8-ounce bottle of lotion costs $4.50. What is the cost per ounce?

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book Other Question

Identify the shape of the graph, transform it into standard form, and sketch the graph.
25x^2 + 4y^2 - 300x - 24y + 836 = 0
I have broken this down into the chart recommended by the book but I can't figure out how the numbers plug into the formula form.I have tried pluging in the numbers several differe