What is the equation of the line that passes through the points (15,9) and (-2,9)?

Because of your favorite lemonade it is $3.84 for 3 gallons. write this as an unit rate

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2