I need help ASAP (could someone also explain it please)

What number produces an irrational number when multiplied by -1.25

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?

Apack of gum would be considered a(n) necessity luxury item small ticket item unaccountable expense