What is the answer to question b and d

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.

In an improper fraction, is the numerator equal to, less than, or greater than the denominator

Which shows how to solve the equation 3/4x=6 for x in one step?