exam Maths Puzzle Numerical Ability

A chemist mixes distilled water with a 90% solution of sulfuric acid to produce a 50% solution. If 5 liters of distilled water is used, how much 50% solution is produced?

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I do not know the steps in graphing the following
X-Y=6
NEED A RESPONSE AS QUICKLY AS POSSIBE AS I AM PREPARING FOR A TEST SHORTLY
THANKS CARMEN The height h in feet of an object after t seconds is given by the function
h = -16t^2 + 30t + 3.
How long will it take the object to hit the ground? Round your answer to the nearest thousandth.

I wish that I knew how to do this problem!