Which inequality matches the graph shown here? Plz help

2-digit numbers less than 91 which are 1 less than a multiple of 10

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Find the values of y: 3y^3(y^2+ 2/3y)=0