:D hi im back with another most likely easy question

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

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).