Suppose that $f$ is an invertible function from $(-\infty,\infty)$ to $(-\infty,\infty)$. If $f(f(x))=x$, find $f(x)-f^{-1}(x)$.

James adds two numbers a + b. sally adds the same two numbers but reverse the order b + a what property of addition assures us that james and sally will get the same sum

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

Dawn is selling her mp3 player for 3 4 of the original price. the original price for the mp3 player was $40. how much is she selling her mp3 player for?