I need help on my Expressions Unit Test can someone help me pl its only 14 questions..

All per-unit concepts rely on ratios,meaning,to provide a type of measurement

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

Adj has a total of 1075 dance and rock songs on her system. the dance selection is 4 times the size of the rock selection. write a system of equations to represent the situation.