exam Maths Puzzle Numerical Ability

Hi. Can I have some help with the following problem?

An equation is given. Find the x- and y-intercepts.

y = sqrt(1 - x^2)

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exam Other Question

8(3^6-x)=40
What is the easiest way to solve for X.
f(x)= { -[-x+1], x <4
- x + 2, -4 < x < -2
[-x2 ], -2 < x <2
x-2 , x >2