PLEASE HELP ME ANSWER THESE TWO QUESTIONS

If x=-3 is the only x-intercept of the graph of a quadratic equation, which statement best discribes the discriminant of the equation?

Over the course of a month, a person's weight decreases. what type of relationship is this? a. positive relationship

Jessica is organizing a guided tour of the rain forest. the average profit per person that the touring company makes is given by the rational expression 18x+35/x, where x is the number of people going on the tour. what does the numerator of this rational expression represents?