Answer:
no it is not
Step-by-step explanation:
First, you have x+y= 3k, x-y= k and what you need to do now is eliminate the y's because they have the same sign (- and +). So now you have x= 3k, x=k. You so then you add the x with the other x (2x) and the 3k with the k (4k). Now you have 2x = 4k , which is the same as x = 2k. Now that you now x in terms of k, you can put it in the very first system, like this: 2k+y=3k, 2k-y=k. If you solve them, first one and then the other, you will get the same result: y=k.
So, you can say that x=2k and k=y.
Hope that was helpful, have a good day! :))
Answer: a. 19.200 to 20.800
Step-by-step explanation:
Formula to find the confidence interval
:-

, where n is the sample size
= Population standard deviation.
= Sample mean
= Two tailed z-value for significance level of
.
Given : Confidence level = 95.44% = 0.9544
Significance level = 
Using standard normal z-value table ,
Two tailed z-value for Significance level of 0.0456 :

Also,
n=144

Then, the required 95.44% confidence interval for the population mean :-

Hence, the 95.44% confidence interval for the population mean is <u>19.200 to 20.800</u>.
The equation representing the real-world scenario is linear as shown io the graph.
Generally, a linear equation takes the form:

The slope (m) is calculated using the formula:

On the line, we have the points: (0, 1600), (4, 1200)
Substituting we have:

The y-intercept is the value of the y-axis when the line cuts the y-axis
y-intercept : (0, 1600)
Hence, the equation is: