Plz me i could really use it and i would be so cause i really suck at math: )

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.

Which is f(5) for the function –2x2 + 2x - 3?

Which number line correctly shows 0.8 + 0.3?