Which graph represents the hyperbola x^2/5^2 - y^2/4^2 = 1?

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

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

In which direction does the left side of the graph of this function point? a(x) = 3x - x2 + 4x - 2