Which pair of functions are inverses of each other?

What number must you add to complete the square x^2+12x=16

Rose bought a new hat when she was on vacation. the following formula describes the percent sales tax rose paid b=t-c/c

When you dilate a figure with a scale factor of 1/2, what will the dilated figure look like?                                                                                           a: the dilated figure will have side lengths that are half the length of the original side lengths.                                                                          b: the angles in the dilated figure will be half the measure of the original figure.                                                                                c: the dilated figure will have side lengths twice the length of the original.