Asmall salad has 220 calories. one slice of pizza has 350 calories. how many calories are in a salad and three slices of pizza?

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?

How can you tell when x and y are not directly proportional?

Could somebody me with this radical simplification?