In March 2011, the Pew Research Center conducted a survey of US adults to determine whether higher education provides students with a good value compared to the cost. Pollsters randomly selected 2,142 adults ages 18 and older living in the continental US. A total of 1,052 interviews were completed with respondents contacted by landline telephone and 1,090 with those contacted on their cellular phone. Which feature of the sampling plan makes the sample representative of the population?

Group of answer choices

The reputable organization conducting the study (the Pew Research Center)

The large sample size of 2,142 adults

The random selection of adults

i need a picure

step-by-step explanation:

(b) 240

step-by-step explanation:

first, we use the pythagorean formula using the given side lengths to find x. then we use x to find the side lengths. then we add the side lengths to find the perimeter.

pythagorean theorem formula:

a^2 + b^2 = c^2

(x - 20)^2 + (x - 40)^2 = x^2

x^2 - 40x + 400 + x^2 - 80x + 1600 = x^2

x^2 -120x + 2000 = 0

(x - 100)(x - 20) = 0

x - 100 = 0 or x - 20 = 0

x = 100 or x = 20

we see that the solution x = 20 must be discarded because it will give a negative side length and a side length of 0. the only valid solution is x = 100.

perimeter = sum of the lengths of the sides

perimeter = x + x - 20 + x - 40

perimeter = 3x - 60

replace x with 100.

perimeter = 3(100) - 60

perimeter = 300 - 60

perimeter = 240

$113.42

i hope that is right.

step-by-step explanation:

abby has a greater debt becasue she owea 5 more then alan does