Not sure how simplified you need it...
8ab-3b+8
Answer: A
Explaination:
The cause and effect relationship of a certain phenomenon under controlled condition
For margin of error to be a maximum of 3:
3 = z*(SD / sqrt(n)), where z is the z-score, SD is the standard deviation and n is the sample size.
z = 1.96 for a 95% confidence interval, and we are given SD = 15.
3 = 1.96*15/sqrt(n)
sqrt(n) = 9.8
n = 96.04 ~ 96 commercials.
+1,-1 and your other would be 1,1
Answer:

Step-by-step explanation:


The rationalizing factor of 
is 