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ExtremeBDS [4]
3 years ago
11

Please help I'll give brainliest to right answer 20m + 6m − 17m = 9 What does "M" equal?

Mathematics
1 answer:
Dmitry [639]3 years ago
3 0

Answer:

m is 1

Step-by-step explanation:

ez mathzzzzzzzzzzz

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3- blank = 11<br><br> Please help
Fantom [35]

Answer:

14

Step-by-step explanation:

3+11=14

soo that is the answer (i read it correctly it is the right answer)

6 0
3 years ago
Read 2 more answers
g If a random sample of 18 deliveries was selected instead and the standard deviation of these delivery times was found to be 9.
lana [24]

Answer:

We can use the z score formula given by:

z= \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}

If we use this formula we got:

z=\frac{21-20}{\frac{9.31}{\sqrt{18}}}= 0.456

z=\frac{25-20}{\frac{9.31}{\sqrt{18}}}= 2.279

And using a calculator, excel or the normal standard table and we have that:

P(0.456

Step-by-step explanation:

We assume this previous info:  It is known that the amounts of time required for room-service delivery at a certain Marriott Hotel are Normally distributed with the average delivery time of 20 minutes.

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 to the problem

Let X the random variable that represent the delivery times of a population, and for this case we know the distribution for X is given by:

X \sim N(20,9.31)  

Where \mu=20 and \sigma=9.31

Since the distribution for X is normal then the distribution for the sample mean \bar X is given by:

\bar X \sim N(\mu, \frac{\sigma}{\sqrt{n}})

And we can use the z score formula given by:

z= \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n}}}

If we use this formula we got:

z=\frac{21-20}{\frac{9.31}{\sqrt{18}}}= 0.456

z=\frac{25-20}{\frac{9.31}{\sqrt{18}}}= 2.279

And using a calculator, excel or the normal standard table and we have that:

P(0.456

6 0
3 years ago
What is the value of x in this equation: 4x+5=3x+4<br><br>​
zavuch27 [327]
Move everything to one side, it becomes negative
3x+4-4x-5
=-x-1
6 0
2 years ago
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4) A safe contains 120 coins, the value of which is $10. If the coins consist of nickels and dimes, how many of each kind are in
Sergio [31]
120=x+y and 10=.05x+.10y
120-x=y then subsitute 10=.05x+.10(120-x) distruibte and solve you can do it feel free to go off of my math.
x(nickels) y(dimes)

3 0
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Candace used a compass to draw the circle shown here. She then used the same compass setting to mark off arcs on the circumferen
Scrat [10]
The answer is C yeah-
8 0
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