Help help help help help pls pls pls

Is the orthocenter of a triangle on the inside ?

What is f(3) for the quadratic function f(x)= 2x^2+ + x - 12

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!