16 workers take 9 days to do a work. How many days 12 workers
take to do?

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?

What’s the answer ? use the picture to see the problem

Simplify each expression. use positive exponents. show work . (x –2 y –4 x 3 ) –2