What are the coordinates of triangle (ABC) when reflected across the y-axis?

Question 10jur's car can travel 340 miles on 12 gallons. jack's car can travel 390 miles on16 gallons. which person has the best mileage (miles per gallon) and what istheir mileage?

Someone me! if you’re smart you can solve this!

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.