Roberto is saving up for a new computer. The graph shows the amount of money that Roberto has left to save before he has enough to purchase the computer. Which sentence is true?

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

Sara needs to take a taxi to get to the movies the taxi charges $4.00 for the first mile and then $2.75 for each mile after that if the total charge is $20.50 then how far was sara’s taxi ride to the movie

What values of x satisfy the inequality x^2-9x< 0? how is your answer shown on the graph?