Answer: We support the null hypothesis.
Step-by-step explanation:
Given : The purpose of the study was to determine whether the mean weekly number of hours that Internet users in that age group spend online differs from the mean for Internet users in general which is 12.50 hours.
The set of hypothesis for the given claim :-
A 95% confidence interval for the mean weekly number of hours that Internet users in that age group spend online was calculated to be (11.439 , 12.577).
Since 12.50 contained in the 95% confidence interval (11.439 , 12.577).
Therefore, we support the null hypothesis.
So the final conclusion will be, we have evidence to support the claim that Internet users in that age group spend online differs from the mean for Internet users in general which is 12.50 hours.
Answer:
x = 5
Step-by-step explanation:
x + 4 = 9
x = 5
Can I get brainliest
So these are our two equations: 
Before we can use elimination, subtract y on both sides of the first equation: 
Now we are able to use elimination. To eliminate the y variable, add the two equations together to get 
. From here we can solve for x.
For this, just divide both sides by 3 and your first answer will be 
Now that we have the value of x, substitute it into either equation to solve for y:
<u>In short, x = 3 and y = 6.</u>
No, because in the first one the 4 is negative, in the second it is positive
The given data is
x f(x)
---- --------
12 0
20 800
30 1800
where
x = number of clients per month
f(x) = monthly revenue
A graph of the data is shown below.
Let the equation of the line be
y = mx + c
The x-intercept is 12, therefore
12m + c = 0 (1)
The line passes through (30, 1800) and (12,0). Therefore the slope is
m = 1800/(30-12) = 100 (2)
From (1), obtain
c = -12m = -12*100 = -1200
Therefore
y = 100x - 1200
Answer: D. f(x) = 100x - 1200
