Ineed with these questions from 9 through thirteen explain as well

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

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!

If you can solve all of these i will give ! - 4% of 190 - 4% of 162.5 - 4% of 140 - a 4% increase from 155.1 - a 4% increase from 159.8