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Naddik [55]
3 years ago
8

D = r t: A train travels 300 miles on level ground in the same amount of time it travels 120 miles in the mountains. The rate of

the train in the mountains is 30 mph. Find the rate of the train on level ground and in the mountains.​
Mathematics
1 answer:
Ugo [173]3 years ago
3 0

Answer:

The rate of the train on level ground is 75 mph, and the rate of the train in the mountains is 30 mph like you mentioned. If you were asking for the time it takes for the train to travel 120 miles in that speed in the mountain, then it would be 4 hours.

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Answer:

  8.6

Step-by-step explanation:

The growth factor per year is 1.012, so in 500 years is ...

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  2^n = 1.012^500

Taking logarithms, we have ...

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About 8.6 doublings will take place in 500 years.

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The International Air Transport Association surveys business travelers to develop quality ratings for transatlantic gateway airp
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Answer:

(5.4582 ; 6.8618)

Step-by-step explanation:

Given the data:

6 10 2 6 3 3 3 6 6 6 6 5 8 9 10 10 7 9 3 6 5 10 9 9 10 3 8 6 6 3 3 6 6 5 4 10 9 3 5 7 10 6 3 8 6 8 3 3 5 5

Sample mean, xbar = Σx / n

n = sample size = 50

ΣX = 308

xbar = 308 / 50 = 6.16

Using a Calculator :

The sample standard deviation, s = 2.469

Confidence interval = xbar ± margin of error

Margin of Error = Tcritical * s/sqrt(n)

Tcritical at 95% ; df = 50 - 1 = 49

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