exam Maths Puzzle Numerical Ability

x to the power of 2 + 2x - 15

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exam Other Question

Petrolyn oil is a combination of natural oil and synthetic oil-- 3parts natural oil for every 5 parts of synthetic oil. How many liters of Petrolyn oil can be made from 400 liters of synthetic oil? Find the axis of symmetry.
y=-x^2-10x+7

I am still not getting this, can you assist one more time?
Thanks