At a party, four identical tables are placed side by side. The length of each table is x and the width of each table is 2.5x-3. Which expressions represent the perimeter of the rectangle formed by all of the tables together? (Imagine the tables are pushed together side by side. I suggest drawing a picture. Choose ALL that apply.

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?

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.

Which best explains why this triangle is or is not a right triangle ?