Kat had 2 3/5 bags of carrots. she gave 3/4 of a bag of carrots to her sister which shows how many bags of carrots kat had left

Which expression is equivalent to (3^2)^-2 a.-81 b.-12 c.1/81 d.1/12

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?

Apasta salad was chilled in the refrigerator at 35° f overnight for 9 hours. the temperature of the pasta dish dropped from 86° f to 38° f. what was the average rate of cooling per hour?