A model train is 9 centimeters long. The actual engine is 18 meters long. What is the scale of the model? Tracy has a model trai
1 answer:
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Answer:
Step-by-step explanation:
General equation of circle is ---------------------(1)
This circle passes through the given three points, (1,7) , (8,6) and (7,-1).
Substitute (1,7) in (1),
1 + =0
2g + 14f + c = -50 -------------(2)
Substitute (8,6) in (1),
16g + 12f + c = -100 -----------(3)
Substitute (7,-1) in (1),
14g - 2f + c = -50 ---------------(4)
Solving (2),(3) amd (4) simultaneously,
g = -4
f = -3
c = 0
Equation of circle is
Answer: Option 'd' is correct.
Step-by-step explanation:
Since we have given that
Margin of error = 0.5 years
Standard deviation = 5
At 90% confidence, z = 1.645
We need to find the minimum size of the sample they must take.
So,
Hence, Option 'd' is correct.