exam Maths Puzzle Numerical Ability

What is the line of symmetry for the graph of y=x^2-4x-5?

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Help im having a hrad time with these problems. Please break them down so i can learn the steps to solving them. Thank you

1. Simplify and evaluate:
(x7y-4z0/5-2x3y-8z- 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