60 60 and 60. Hope I helped!
I can only help you with the second one. It is a positive correlation because it is going upwards. Good luck with the first one!
For this question the answer would be x=-3 and x=-2
Answer:
The second expression is the product of the above expressions.....
Given :
p = 0.68
margin of error, E = 0.1
99% confident interval
alpha, α = 1 - 0.99
= 0.01

∴
(z-critical value)
Sample size = 


= 144.37
= 145 (rounded off)
Therefore, there are 145 businesses does she need to sample to meet this criteria.