Answer:

Step-by-step explanation:
Assuming conditions are met, the formula for a confidence interval (CI) for the difference between two population proportions is
where
and
are the sample proportion and sample size of the first sample, and
and
are the sample proportion and sample size of the second sample.
We see that
and
. We also know that a 98% confidence level corresponds to a critical value of
, so we can plug these values into the formula to get our desired confidence interval:

Hence, we are 98% confident that the true difference in the proportion of people that live in a city who identify as a democrat and the proportion of people that live in a rural area who identify as a democrat is contained within the interval {-0.2941,-0.0337}
The 98% confidence interval also suggests that it may be more likely that identified democrats in a rural area have a greater proportion than identified democrats in a city since the differences in the interval are less than 0.
Answer:
b
Step-by-step explanation:
Answer:
The base is 27 units long.
Step-by-step explanation:
This is a solve the system question. Call the length of the base B and the length of each leg L. We are told:

and

Sub the first equation into the second:

Now that we have the leg length, sub that into either of the original equations to find the base. I'll use the first equation:

Answer:
(0, -4)
Step-by-step explanation:
We can just substitute the y's like this: 2x - 4 = -2x - 4
Move like terms to one side by adding 2x to both sides
2x - 4 = -2x - 4
+ 2x + 2x
4x - 4 = - 4
Add 4 to both sides
4x - 4 = - 4
+ 4 + 4
4x = 0
Divide both sides by 4
4x/4 = 0/4
x = 0
Plug in the new x into one of the original equations
y = 2(0) - 4
y = 0 - 4
y = - 4