book Maths Puzzle Numerical Ability

trying to work a problem to see if the set of points could be vertices of a right triangle.
(-4,5), (6,1), and (-8,-5)
Im not sure what to do with 3 sets of numbers using the dis

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book Other Question

How do you graph piecewise functions?

Example:
f(x) = {x+2 if x< or equal to -2
{3x if x>-2

Do you substitute x with a number that satisfies the inequality? If so, w SOME MATHMATICAL APPLICATIONS IN BUSINESS INVOLVE FINDING A BREAK-EVEN POINT. THE BREAK-EVEN POINT REPRESENTS THE NUMBER OF ITEM PRODUCED AND SOLD SUCH THAT THE COST OF PRODUCING