I don’t understand this

Name each raycalculation tip: in ray "ab", a is the endpoint of the ray.

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.

What is the product? a-3/15a × 5/a-3