Tell how to choose the sign of the radical in the denominator of the formula for the distance from a point to a line. PLZ HURRY!!

I do NOT understand this.

Which ahows the graph of the solution set of 6x+4y< 12

Haruka hiked several kilometers in the morning. she hiked only 66 kilometers in the afternoon, which was 25% less than she had hiked in the morning. how many kilometers did haruka hike in all?

You and a friend went to the movies.you spent half your money on tickets. then you spent 1/4 of the money on popcorn, $2 on candy, and $3 on a soda. if you have $1 left, hiw much money did u take to the movies?