book Maths Puzzle Numerical Ability

What is the square root of x^2+y^2

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book Other Question

please help
if x iss inversely proportional to y, and x=60 when y=0.5, find x when y=12.
a).04
b)2.5
c)25
d)360
I have looked in so many places to find a solution or method for this, and I have not succeeded. I would appreciate some help!

f(x) = 0

f(x) = x^2 + 2x - 1