A psychologist studied the physiological effects of crowding by varying the number of rats in a cage with conditions of crowding (10 rats in a cage) or not (2 rats in a cage). After two months the adrenal glands of the rats were weighted to the nearest .01 grams to assess stress level. What is the dependent variable in this study, and what scale of measurement is it based on?

x+y=90

x=30-y=x

step-by-step explanation:

if you understand you will get the answer

16

step-by-step explanation:

2 x 40 = 80

80/5

= 16

region b will make the inequalities y < 2x + 1 and y > -x - 2 true ⇒ answer a

step-by-step explanation:

* lets study the graph and the inequality to solve the question

- the inequality y > -x - 2

∵ the form of the inequality is y > mx + c , m is the slope of the line

  and c is the y-intercept (the line intersect y-axis at point (0 , c)

∴ c = -2 that means the line intersect the y-axis at point (0 , -2)

∵ the sign of the inequality is >

∴ we shad the part over the line

  region a and b

- the inequality y < 2x + 1

∵ the form of the inequality is y > mx + c , m is the slope of the line

  and c is the y-intercept (the line intersect y-axis at point (0 , c)

∴ c = 1 that means the line intersect the y-axis at point (0 , 1)

∵ the sign of the inequality is <

∴ we shad the part under the line

  region b and c

∵ the common region between the two lines is region b

∴ region b will make the inequalities y < 2x + 1 and y > -x - 2 true