exam Maths Puzzle Numerical Ability

Using the graph of y=-x^2+4x+5. what is the equation of the line of symmetry for this graph?

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I have a question on a story problem...
Mary has a total of $4.75 in her bank. There are 39 coins in all: some are dimes are some are quarters. How many coins of each are there in her bank?
please
d+q=39
10d+25q=475 Please help me, i need to know how to solve this for a test tommorow!

What are the zeros of f(x)=-3(x-2)^2 + 5