book Maths Puzzle Numerical Ability

please can i get help wit finding the axis of symmetry of y=2x to the second power+8x-2

and i ned help on finding the coordinates formula
y=-x to the second power-5x-5

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book Other Question

you bought 20 litre's of ammonia to clean your house. how many litre's of water does it take to make 10 litre's of 10% ammonia solution? in triangle abd c is on bd, the length of ad is 6 inches, and sin d=0.8. how many inches long is cd