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HACTEHA [7]
3 years ago
12

A car is traveling at a rate of 50 miles per hour, while a motorcycle is traveling at 70 miles per hour. The car takes 4 hours l

onger to arrive at the destination. The equation representing the scenario is 50(x + 4) = 70x. What can be concluded about the equation? Check all that apply. The scenario is translated to car's travel distance = motorcycle's travel distance. The expression 70x represents the hours the motorcycle traveled. The expression (x + 4) represents the number of hours traveled by the car. The variable x represents the total hours driven by the motorcycle. The car's travel distance is represented as 50(x + 4). Intro Done​
Mathematics
1 answer:
mihalych1998 [28]3 years ago
3 0

Answer:

Step-by-step explanation:

the answers are

A.

C.

D.

E.

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Answer:

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Step-by-step explanation:

First we stablish the data that we have for each sample:

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To calculate the standard error of each sample we would use the formulas:

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Now, in order to obtain the standard error of the differences between the two sample means we combine those two formulas to obtain this:

σx¯1 - σ x¯2  = √(σ₁²/n₁ + σ₂²/n₂ )

So as you can see, we used the square root to simplify and now we require the variance of each sample (σ²):

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σ₂² = (15)² = 225

Now we can proceed to calculate the standard error of the distribution of differences in sample means:

σx¯1 - σx¯2  = √(196/100 + 225/90) =  2.11

This gives an estimate about how far is the difference between the sample means from the actual difference between the populations means.

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