9514 1404 393
Answer:
A, C
Step-by-step explanation:
The given ratio can be reduced by removing a factor of 2 from each element.
8 : 6 = 4 : 3 . . . . matches A
It can be put in other forms by multiplying each element by the same factor. Using a factor of 2 on the original ratio values, we get ...
8 : 6 = 16 : 12 . . matches C
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Any ratio that doesn't reduce to the integer ratio 4 : 3 is not equivalent. The ratio with elements reversed (3:4) is not equivalent.
We can solve this system of equation by reduction method.
d+e=15
-d+e=-5
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2e=10 ⇒e=10/2=5
-(d+e=15)
-d+e=-5
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-2d=-20 ⇒d=-20/-2=10
therefore: d=10; e=5
Answer: d.(10,5)
Answer:
B (-17,7)
Step-by-step explanation:
A point reflected over the Y-Axis just changes the x sign. So (17,7) changes to (-17,7). The 17 to -17. The y stays as a 7.
Hope this helps.
a) The population is all of the flights belonging to the particular airline. It's not all flights in general because the airline does not have control over a rival company's flight schedule.
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b) The sample is the 5 airlines the company selected. Ideally the sample should represent the population as much as possible. The larger the sample, the more representative the sample is.
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c) No, the sample is likely <u>not</u> representative because one day of flight does not represent the entire lifetime of all flights done so far for that company. This particular day could have been a very good day with good weather, which may explain why the 5 flights were all on time.
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d) It would be better for the company to select the days at random and sample all of the flights for those particular days chosen. This is a cluster sample. Each cluster is a day. Also, I think more flights should be sampled. Five flights does not seem like enough.
