The perimeter of the triangle ABC is 89 cm. Side AC is 47 cm less than the sum of the other two sides. Side BC is 20 cm more than half of side AB. Find the measures of each side of the triangle ABC. (Extra Credit: 5 points up
if solved by using determinant and Cramer’s Rule)

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?