Someone help please me with all 3 questions:) marking brainlist!!

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

Find the equation of the line with slope =8 and passing through (6,53) write your equation in the form y=mx+b

Awater truck is filling a swimming pool. the equation that represents this relationship is y=19.75x where y is the number of gallons of water in the pool and x is the number of minutes the truck has been filling the pool.