Interior angles in any triangle sum up to 180 so 180-(30+40)=110
So the exterior angles equals 180-110= 70
70 is the final answer i hope it helps and good luck
45, 46, 47, 48, 49, 51, 52, 53, 54
9*9*x=1620
81*x=1620 (divide out the 81)
x=20
Answer:
99% confidence interval is:
(0.00278 < P1 - P2< 0.15921)
Step-by-step explanation:
For calculating a confidence intervale for the difference between the proportions of workers in the two cities, we calculate the following:

Where
: proportion sample of individuals who worked
at more than one job in the city one
: Number of respondents in the city one
: proportion sample of individuals who worked
at more than one job in the city two
: Number of respondents in the city two
Then
α = 0.01 and α/2 = 0.005
and 


and 
The confidence interval is:

(0.00278 < P1 - P2< 0.15921)