Fr33 p0ints/ umm? please help me with this question

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

Do one of the following, as appropriate: (a) find the critical value z subscript alpha divided by 2 , (b) find the critical value t subscript alpha divided by 2 . 99%; nequals 17; sigma is unknown; population appears to be normally distributed.

Benefit(s) from large economies of scale, in which the costs of goods decrease as output increases. natural monopolles perfect competition