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Ronch [10]
3 years ago
13

Suppose the time to complete a 200-meter backstroke swim for female competitive swimmers is normally distributed with a mean μ =

141 seconds and a standard deviation σ = 7 seconds. what is the completion time for the 200-meter backstroke for a female with a z-score of −1.64? (round answer to 1 decimal place.)
Mathematics
1 answer:
MatroZZZ [7]3 years ago
8 0

Answer :hola quoo msal

Step-by-step explanation:

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How many solutions does the system have?
Mrac [35]

Answer:

A Exactly one solution

Step-by-step explanation:

\left \{ {{6x-3y=9} \atop {6x+y=9}} \right.\\\\\left \{ {{6x-3y=9} \atop {-6x-y=-9}} \right\\\\Then, \\\\-4y=0\\\\\\ y=0\\\\

Putting y=0 at second equation, we have

-6x=-9\\\\x=\frac{9}{6} =\frac{3}{2}

The unique solution is (\frac{3}{2} , 0)

3 0
3 years ago
A cashier can ring up 12 items per minute. How long will it take the cashier to ring up 72 items? ​
Talja [164]

Answer:

So it will take 6 minutes to ring up 72 items.

Step-by-step explanation:

Well this seems pretty simple just have to reads the question and know what to find.

So what we know :

A cashier can ring up 12 items per minute

So :

1 minute = 12 Minutes

And we have to find :

How long for 72 items

So since we know he can do 12 in a minute and it is asking how many minutes it will take for 72 we can divide.

So :

72 / 12

=

6

So it will take 6 minutes to ring up 72 items.

I hope this helps!

If you have any questions or concerns feel free to message me or comment. :)

8 0
3 years ago
Brianna can buy 14 pencils for $1.50 at the school store. At that rate, about how much would 100 pencils cost?
LuckyWell [14K]

Answer:

we conclude that the cost of 100 pencils = $11

Step-by-step explanation:

Brianna can buy 14 pencils for $1.50 at the school store.

so

unit rate =  $1.50 /  14 pencils

              = 0.11 USD per pencil

Thus,

The cost of 1 pencil =  $0.11

The cost of 100 pencils = $0.11 × 100

                                       = $11

Therefore, we conclude that the cost of 100 pencils = $11

5 0
3 years ago
Can someone PLEASE tell me the answer to this
Serjik [45]

Answer:

third option is the correct answer

go with the names of the triangle

the triangles are HIJ and LMN

so the ratios will be accordingly

5 0
3 years ago
Read 2 more answers
Find the measure of each missing angle , and state the angle relationship I used
Delvig [45]
(4x+28)+(x+19)+(3x+13)=180
8x+60=180( combine like terms)
8x+60-60= 180-60
8x=120
8/8x=120/8
x=15
The missing angles are 88°, 34° and 58°
3 0
3 years ago
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