Sharon is making 100 liters of punch for a party. the punch contains ginger ale (g) and fruit juice (f). the cost of the ginger ale is $1 per liter and the fruit juice is $1.50 per liter. if sharon spent a total of $130, how many liters of each did she put in the punch? which system of equations matches the situation?

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?