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love history [14]
3 years ago
14

FORST WILL BE MARKED THE BRAINLIEST

Mathematics
2 answers:
Alex17521 [72]3 years ago
7 0

Answer:

4.5miles

Step-by-step explanation:

Well, he runs 3miles in 28 minutes. Also see that 42=28·1.5.

So his journey would just be running 1.5 times, with each time running 28 minutes. So, he runs a total of 1.5·3 =4.5 miles

beks73 [17]3 years ago
3 0

Answer:

\frac{3 \times 42}{28}  =  \frac{9}{2}  = 4.5

You might be interested in
A statistics student wants to compare his final exam score to his friend's final exam score from last year; however, the two exa
yarga [219]

Answer:

z= \frac{85-70}{10}=1.5

z= \frac{45-35}{5}=2

So then the correct answer for this case is:

B) Our student, Z= 1.50; his friend, Z=2.00.

Step-by-step explanation:

Assuming this complete question:

A statistics student wants to compare his final exam score to his friend's final exam score from last year; however, the two exams were scored on different scales. Remembering what he learned about the advantages of Z scores, he asks his friend for the mean and standard deviation of her class on the exam, as well as her final exam score. Here is the information:

Our student: Final exam score = 85; Class: M = 70; SD = 10.

His friend: Final exam score = 45; Class: M = 35; SD = 5.

The Z score for the student and his friend are:

A) Our student, Z= -1.07; his friend, Z= -1.14.

B) Our student, Z= 1.50; his friend, Z=2.00.

C) Our student, Z= 1.07; his friend, Z= -1.14.

D) Our student, Z= 1.07; his friend, Z= 1.50

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Solution

Let X the random variable that represent the scores for our student, and for this case we know that:

E(X)= \mu =70, SD_X=\sigma=10  

The z score is given by:

z=\frac{x-\mu}{\sigma}

If we use this we got:

z= \frac{85-70}{10}=1.5

Let Y the random variable that represent the scores for his friend, and for this case we know that:

E(Y)= \mu =35, SD_Y=\sigma=5  

The z score is given by:

z=\frac{y-\mu}{\sigma}

If we use this we got:

z= \frac{45-35}{5}=2

So then the correct answer for this case is:

B) Our student, Z= 1.50; his friend, Z=2.00.

3 0
3 years ago
What do you know about parallel slopes; perpendicular slopes?
sukhopar [10]

Answer:

<em>Parallel slopes</em>: two lines that has the same slopes but have different y-intercept

<em>Perpendicular slope</em>: two lines that are negative reciprocals(common) of each other

7 0
3 years ago
Pls help I’ve been stuck on this for a while
White raven [17]

Answer:

Maybe 60

Step-by-step explanation:

I don't know just please guess sorry but can you mark as brainiest.

7 0
3 years ago
Answer please? 50 pts
Lady_Fox [76]

Answer:

It was a

Step-by-step explanation:

3 0
3 years ago
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What is the volume of this rectangular prism
qaws [65]
Volume is 5cm^3 teehee
8 0
2 years ago
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