Please help...A counselor wishes to examine the benefits of a parenting class on parenting skills. He decides to administer a questionnaire to the 10 parents who have
attended the most recent class. How could this study be improved?
Select all that apply.
A. Administer a questionnaire to parents who have not attended the
class.
B. Use a random sample of all patients, who have attended the
class.
C. Increase the sample size.
D. Give parents some sample responses, prior to administering the
questionnaire.

ian gonna lie that is way to much

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm

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.

b

step-by-step explanation: