Ollie has $400 balance on her credit card. she pays $60 a month on the card. does this situation have a positive or negative rate of change? explain

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?

When y’all answer can y’all explain too !

1. find the area of the unshaded square 2. find the area of the large square 3. what is the area of the frame represented by the shaded region show