If john puts 3/4 lbs of roast beef on each sandwich, how many sandwiches can he make from 3 3/4 lbs of roast beef?

Average acceleration: i have no idea how to do this.

What is the length of the segment, endpoints of which are intersections of parabolas y=x^2− 11/4 x− 7/4 and y=− 7 /8 x^2+x+ 31/8 ?

What is the value of the discriminant, b2 ? 4ac, for the quadratic equation 0 = x2 ? 4x + 5, and what does it mean about the number of real solutions the equation has?