Admission for a play is $9 for adults and $5 for students. the first night, the box office sold twice as many adult tickets as student tickets. the second night, the number of each type of ticket sold was three times the number sold the first night. which expression can be used to determine the total amount of money received for sales of tickets on both nights? let a be the number of adult tickets sold and s be the number of student tickets sold.

Stu and ambrose are working together on a study of whether diet is related to students' mental health. first, they randomly select 10 students from the student center and 10 students from the office of counseling and psychological services. then, they ask students to rate their diet in terms of healthiness on a scale of 1-100 before completing a 20-item mental health survey. a) name one of the constructs being studied b) how was the construct you named above operationally defined in this experiment? e) was the variable you described above their independent variable, their dependent variable, or a controlled variable? d) what is a confounding variable? what is a potential confound in this study?