book Maths Puzzle Numerical Ability

Can you please explain to me how you create an equation (function) from looking at a parabola? I can make a parabola from an equation. But not the other way around. I need very easy and explained steps!
Thanks for your time and effort.
-C.

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book Other Question

A cash box contained $12.25 in quarters, dimes, and nickels. If there were five more than twice as many dimes as nickels and one less than three times as many quarters as nickels, how many of each kind of coin was there? let f(x) = 1/x+1 + 3/x-5
find all values of "a" for which : f(a) = f(a+6)