Answer:
Option (C)
Step-by-step explanation:
The given graph represents the relation between her profit and the price charged.
x-intercepts from the graph are at,
x = 20 and x = 65, which show the selling prices.
x-intercepts means y = 0
And y = 0 represents no profit no loss.
When we summarize these data,
zeros : x = 20 and x = 65
These are the selling prices that will give her neither profit nor loss.
Therefore, Option (C) will be the answer.
A confidence interval that will capture the true population mean with 95% confidence. The value is ( 23.6459 , 24.8293 ) .
What is population mean?
A population in statistics is a group of comparable objects or occurrences that are relevant to a particular topic or experiment. A statistical population can be a collection of real things or a hypothetical, possibly limitless collection of objects derived from experience.
Data: 18
for given data

as population variance is unknown so we used sample variance

Now

hence 95 % of population mean is
As n=101 which is large so critical value is 1.98397

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Answer: x = 5 , y = -1
Step-by-step explanation:
Given:
x + y = 4 ................. equation 1
x - y = 6 .................. equation 2
Solving the simultaneous equation by elimination method;
From equation 1 make x the subject of the formula , that is
x = 4 -y ............ equation 3
substitute equation 3 into equation 2 , we have
4 - y - y = 6
4 - 2y = 6
Add 2y to both sides , we have
4 = 6 + 2y
subtract 6 from both sides , we have
4 - 6 = 2y
- 2 = 2y
divide both sides by 2
-2/2 = y
Therefore : y = -1
Substitute y = -1 into equation 3 , we have
x = 4 - (-1)
x = 4 + 1
x = 5