exam Maths Puzzle Numerical Ability

I am having a very hard time trying to figure this out. Can you please help me?

Find the axis of symmetry.

y = -x squared + 6x - 2

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exam Other Question

This is pre-test question that is not in the book.
The function S(t) =239.2-11.5t can be used to estimate the total Cuban sales of windshield-wiper fluid, in thousands of dollars
Solve the system by addition.

4x+8y=-1
8x-4y=-7