Answer:
The complex solutions are

Step-by-step explanation:
<u><em>Step(i):-</em></u>
Given equation 7 x² - 7 x +3=0

Given standard equation
a x² +b x +c =0
a = 7 , b= -7 and c=3
<u><em>Step(ii):-</em></u>
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Answer:
11 months
Step-by-step explanation:
185 - 20 = 165
165 ÷ 15 = 11
Answer:
a) 
b)
c)
Step-by-step explanation:
Assuming the following question: Because of staffing decisions, managers of the Gibson-Marimont Hotel are interested in the variability in the number of rooms occupied per day during a particular season of the year. A sample of 20 days of operation shows a sample mean of 290 rooms occupied per day and a sample standard deviation of 30 rooms
Part a
For this case the best point of estimate for the population variance would be:

Part b
The confidence interval for the population variance is given by the following formula:
The degrees of freedom are given by:
Since the Confidence is 0.90 or 90%, the significance
and
, the critical values for this case are:
And replacing into the formula for the interval we got:
Part c
Now we just take square root on both sides of the interval and we got:
Answer:
B, C, and D
Step-by-step explanation:
Just some simple maths, look at it like railroad tracks and act it out as such, with lines a and b being parallel. Angle 6 is 75, Angle 1 is 105