Determine whether the sampling method described below appears to be sound or is flawed. in a survey of 707 subjects, each was asked how often he or she read a book. the survey subjects were internet users who responded to a question that was posted on a news website.

In a survey of 525 subjects, each was asked how often he or she read a book.  The survey subjects were interest users who responded to a question that  was posted on a news website.  It is flawed because it is a voluntary response sample 2. In a survey of 663 human resource professionals, each was asked about the  importance of the education of a job applicant. The survey subjects were  randomly selected by pollsters from a reputable market research firm. It appears to be sound because the data are not biased in any way 3. Several studies showed that after eating 4 servings of dairy a day, subjects  had lowered risk of osteoporosis. A dairy farmers’ organized financed this  research. What is wrong with this study? Self- interest study 4. Based on a study of weights of men and woman who are vegetarian, a  searcher concludes that eating vegetables causes people to lose weight.

answer:

c 60% on edg

option 3 . (5x + 1) - (-10x + 6)

step-by-step explanation:

option 1 :

(4x + 3) + (-9x + 4)

or 4x+3 -9x + 4

or -5x + 7

option 2

(x - 2) - (6x - 9)

or x-2-6x + 9

or -5x + 7

option 3

(5x+ + 6)

or 5x + 1 + 10x -6

or 15x -5

option 4

-4x+2x+7-3x

-7x + 2x + 7

-5x + 7

hence only option 3 did   not satisfy the given simplify expression.