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docker41 [41]
3 years ago
7

In how many ways you can put 2 books on 5 shelves so that

Mathematics
2 answers:
disa [49]3 years ago
6 0

Answer:

Picking any one of the two books there are five shelves to put it on - which makes five ways to place it and for each of those five ways there are four shelves the other book could go such that the two books are not on the same shelf. That's four ways to place a second book for each of the five ways to place the first. That's a total of 20 ways.

Step-by-step explanation:

Brainly? I only need one more to rank up!

Lostsunrise [7]3 years ago
3 0

Answer:

Step-by-step explanation:

rfgg

You might be interested in
Work out the volume of this hemisphere with diameter 9.6 cm
weqwewe [10]

Answer:

Please refer to the attachment

7 0
3 years ago
ricardo ran the 400-meter race 3 times ,his fastest time was 54.3 seconds, his slowest time was 56.1 seconds, if his average tim
MatroZZZ [7]
Take the 2 times you are given and add them to x and divide the entire left side of the equation by 3:
54.3+56.1+x/3=55
54.3+56.1+x=165
x=54.6
The 3rd lap took him 54.6 seconds to run 
8 0
3 years ago
I really need some help on this question
Leya [2.2K]

Answer:

What is the car's rate in kilometers per minute?

0.9\frac{km}{min}

How many kilometers will the car travel in 5 minutes?

4.5\ km

Step-by-step explanation:

If we know:

\frac{54\ km}{1\ hour}

And there are 60 minutes in an hour:

\frac{1\ hour}{60\ minutes}

We can do:

\frac{54\ km}{1\ hour} * \frac{1\ hour}{60\ minutes} = \frac{54\ km}{60\ minutes} = 0.9 \frac{km}{min}

From here, we figure out the distance from minutes:

0.9\frac{km}{min} * 5 = 4.5\ km

3 0
2 years ago
Can ya'll help me plssssss
KIM [24]

Answer: 8mph

Step-by-step explanation:

If Marco bicycles 20 miles in 2.5 hours. divide 20 by 2.5 to get the average rate.

20/2.5 = 8

(Don't forget to add units)

8mph

4 0
1 year ago
A T-shirt launcher can launch 50 shirts in 20 minutes. What is the rate in shirts per hour?
Mrrafil [7]

Answer: 150

Step-by-step explanation:

20 is 1/3 of 60. So you can just multiply 50x3 so the answer becomes 150.

8 0
3 years ago
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