What are the x- and y-interception of the graph of y=x^2-10x+21

Tamera puts 15/4 gallons of gasoline in her car. which mixed number represents the gallons of gasoline? a) 2 3/4 gallons b) 3 1/4 gallons c) 3 3/4 gallons d) 4 1/2 gallons answer it's worth a lot of points!

When y’all answer can y’all explain too !

You receive 15% of the profit from a car wash how much money do you receive from a profit of 300