What is the smiplest ratio for 75cm:1m:250 mm​

How can you decide witch operations to use to slice a two step equation

When turned about its axis of rotation, which shape could have created this three-dimensional object?

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?