Answer:
9(8w+9x-10)
72w+10x-90
Step-by-step explanation:
All you have to do is multiply 9 by everything inside the parentheses.
Hope it helps! :)
Answer: a) Required minimum sample size= 219
b) Required minimum sample size= 271
Step-by-step explanation:
As per given , we have
Margin of error : E= 5% =0.05
Critical z-value for 90% confidence interval : 
a) Prior estimate of true proportion: p=28%=0.28
Formula to find the sample size :-

Required minimum sample size= 219
b) If no estimate of true proportion is given , then we assume p= 0.5
Formula to find the sample size :-

Required minimum sample size= 271
I don’t see anything is there supposed to be a picture or?