What does is the value of x in this problem

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.

Adeposit of 5500 at 6% for 3 years equals

Which equation represents a direct linear variationa. y=x2b. y=2/5xc. y=1/xd. y=x+3