Hola! Necesito ayuda con esto, tengo que encontrar el dominio y rango de esta gráfica. Les agradezco mucho si me ayudan.

The head librarian at the library of congress has asked her assistant for an interval estimate of the mean number of books checked out each day. the assistant provides the following interval estimate: from 740 to 920 books per day. what is an efficient, unbiased point estimate of the number of books checked out each day at the library of congress?

Need this asap if anyone can i would be very grateful. if you could show workings that would really

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.