Carlos is walking on a moving walkway. his speed is given by the function
c(x) = 3 x
2
+ 3x - 4, and the speed of the walkway is w(x) = x
2 - 4x + 7.
20. what is his total speed as he walks along the moving walkway?
21. carlos turned around because he left his cell phone at a restaurant.
what was his speed as he walked against the moving walkway?

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?