Isabelle is conducting a survey at the local mall this weekend. she will go to the food court and ask several dozen people at random to rate the quality of different stores on a scale of 1 to 5. she will use her results to draw conclusions about the opinions of weekend mall-goers. what could isabelle do to ensure that her conclusions are better supported by her survey results?

step-by-step explanation:

answer: 0.1,0.85

step-by-step explanation:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -