exam Maths Puzzle Numerical Ability

Simplify: -3x^0 + (1/2)^-2 - (-2)^3

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My question is: Suppose that you have a supply of a 30%solution of alcohol
and 70% of solution of alcohol. how many quartz of each should be mixed to poduce 20 quartz that is 40%alcohol? I need help determining what this graph would look like. can you help?:g(x)f(x-3)-2. i understand that it will look like a U, however not sure which way it will move.