Will give brainliest a zoo train ride costs $3 per adult and $1 per child. on a certain day, the total number of adults (a) and children (c) who took the ride was 30, and the total money collected was $50. what was the number of children and the number of adults who took the train ride that day, and which pair of equations can be solved to find the numbers?

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?