Write a simplified polynomial expression in standard form to represent the area of the rectangle below. (2 points) A picture of a rectangle is shown with one side labeled as 2 x minus 4 and another side labeled as x plus 5 A. 2x2 + 6x − 20
B. 2x2 − 4x − 20
C. 2x2 + 6x + 20
D. 2x2 + 10x + 20

Which of the following statements is true? a. the irrational number system is not closed under multiplication, because the product of two irrational numbers is always a rational number. b. the irrational number system is not closed under multiplication, because the product of two irrational numbers is not always an irrational number. c. the irrational number system is closed under multiplication, because the product of two irrational numbers is always an irrational number. d. the irrational number system is closed under multiplication, because the product of two irrational numbers is always a rational numbers. reset submit

Which of the following points is a solution to the system of equations shown? y - x = -1 x + y = -5

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?