Exam Maths Puzzle Algebra

For the following piecewise defined function find f(-1)

f(x)={x^2+1,......x<0
{x-1,........x>0

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Exam Other Question

State the domain of r(x) and range of r(x) in the equation r(x)=(6x+12)/(x^2-16) Find the slope of the line that passes through each pair of points (3,-1),(-4,-1)