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Slav-nsk [51]
3 years ago
13

2: Si je cours à 12 km/h, en combien de minutes est-ce que je parcours 1 km ?​

Mathematics
1 answer:
serious [3.7K]3 years ago
4 0

Answer: cinq minutes

Step-by-step explanation: 1h est egalle à 60minutes. Alors I'll a couru 12km Dan's 60minute. La duration pour 1km sera 60÷12=5 minutes

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Amanda composed 2 songs. The longer song is 126 seconds less than twice the length of the short song. The longer song lasts 286
xxMikexx [17]

LongSong = 286s

LongSong = 2 * ShortSong - 126s

=>

2 * ShortSong - 126s = 286s

2 * ShortSong = 286s + 126s

2 * ShortSong = 412s

ShortSong = 206s

5 0
3 years ago
What is the unit rate of $4 and 8 pounds
Stolb23 [73]

Answer:

32

Step-by-step explanation:

4 0
3 years ago
Please answer correctly !!!!!!!!!!!!!!!!!! Will mark brainliest !!!!!!!!!!!!!!!!!!!
quester [9]

9514 1404 393

Answer:

  see below

Step-by-step explanation:

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8 0
3 years ago
. A study was done on the proportion of cities that have private refuse collectors. The student wants the margin of error to be
ELEN [110]

Answer: 68

Step-by-step explanation:

As per given , we have

Margin of error : E= 0.10

Critical z-value for 90% confidence interval : z_{\alpha/2}=1.645

Since , the estimate of true proportion is unknown , then

The formula to find the sample size :-

n=0.25(\dfrac{z_{\alpha/2}}{E})^2\\\\ n=0.25(\dfrac{1.645}{0.10})^2\\\\ n=67.650625\approx68

The required minimum sample size= 68

5 0
4 years ago
A passenger train leaves a railway station at 12:00 pm and travels 3 hours on the Northbound track. A second passenger train lea
Aliun [14]

Answer:

63 kilometers per hour for train A and 83 kilometers for train B

Step-by-step explanation:

Same beginning

  • Train A: 3 hours to North
  • Train B: 2 hours and 15 minutes to South

but train B <em>2</em><em>0</em><em> </em><em>kilometers </em><em>per hour </em><em>faster</em>

15 minutes from 20 kilometers per hours are 5 kilometers

So, train B is 45 kilometers travel more far than train B.

= 360 kilometers - 45 kilometers

= 315 kilometers ÷ 5 hours

= 63 kilometers per hours

Hope it's right><

3 0
3 years ago
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