Can you help thank youu

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

What is true about the dilation? it is a reduction with a scale factor between 0 and 1. it is a reduction with a scale factor greater than 1. it is an enlargement with a scale factor between 0 and 1. it is an enlargement with a scale factor greater than 1.

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left