Which student score changed the most? Student A -1 student B 0 student C -3 and student D : 2

In the coordinate plan (-6,9) b (3,9) c (3,3) def is shown in the coordinate plan below

Plzzz i beg u so much asaaaap ! what is the slope of this line? enter your answer in the box.

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.