Need help asap please help ive been trying and as you can see my attempts

What is the length of the segment joining the points at (4,5) and (6,-2) round to the nearest tenth if necessary

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

Players on the school soccer team are selling candles to raise money for an upcoming trip. each player has 24 candles to sell. if a player sells 4 candles a profit of$30 is made. if he sells 12 candles a profit of $70 is made. determine an equation to model his situation?