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IrinaK [193]
3 years ago
7

f one pump can inflate an air mattress in 21 minutes and a second pump can inflate the same mattress in 42 ​minutes, find the am

ount of time that would be needed for the two pumps working together to inflate the mattress.
Mathematics
1 answer:
Schach [20]3 years ago
3 0

Answer:

14 minutes

Step-by-step explanation:

Ⓗⓘ ⓣⓗⓔⓡⓔ

Well, what I do for these problems is do 1/x with x being the amount of time given.

1/21+1/42=3/42

3/42=1/14

Together, they would take 14 minutes!

(っ◔◡◔)っ ♥ Hope this helped! Have a great day! :) ♥

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The dot plot below shows the number of toys 21 shops sold in an hour:
Firlakuza [10]

Answer: A.Median; because the data is not symmetric and there are outliers

Step-by-step explanation:

From the given dot plot , we can see that the data plot is skewed not symmetric .

Aldo there are outliers at 9 since most of the dots are between 0 to 4.

We know that the median provides better description of the center of the data then mean when the data is skewed.

Therefore , the median is a better center for this data because the data is not symmetric and there are outliers.

3 0
2 years ago
I will give brainliest
ioda

Answer:

2,-5,-12,-19,-26

Step-by-step explanation:

-7n +9

-7(1) +9 = 2

-7(2)+ 9= -5

-7(3)+9 = -12

-7(4)+9 = -19

-7(5)+9 = -26

7 0
2 years ago
A pair of dice are rolled. What is the probability of rolling 4 or greater?
skelet666 [1.2K]
Answer: option D: 11/12

Explanation:

1) The sample space is formed by 36 pairs: 6×6 = 36.

2) Roolling 4 or more is the same that not rolling 3 or less

3) Rolling 3 or less are (1,1), (1,2), and (2,1). Those are 3 outcomes out of 36.

4) Therefore, not rolling 3 or less (the same that rolling 4 or more) has 36 - 3 = 33 outcomes out of 36.

5) The probability of 33 out of 36 is 33/36

6) Simplify the fraction 33/36 = 11/12

And that is the answer.


6 0
3 years ago
Help me plz u will make my day
oksian1 [2.3K]

Answer:

18 1/3. You add 18 1/3 to cancel out that number.

Step-by-step explanation:

5 0
3 years ago
Find the product.<br> (6 - d)(d 2 - 5 + 3d)
Delvig [45]
<span><span>(<span>6−d</span>)</span><span>(<span><span><span>d^2</span>−5</span>+<span>3d</span></span>)</span></span><span>=<span><span>(<span>6+<span>−d</span></span>)</span><span>(<span><span><span>d^2</span>+<span>−5</span></span>+<span>3d</span></span>)</span></span></span><span>=<span><span><span><span><span><span><span>(6)</span><span>(<span>d^2</span>)</span></span>+<span><span>(6)</span><span>(<span>−5</span>)</span></span></span>+<span><span>(6)</span><span>(<span>3d</span>)</span></span></span>+<span><span>(<span>−d</span>)</span><span>(<span>d^2</span>)</span></span></span>+<span><span>(<span>−d</span>)</span><span>(<span>−5</span>)</span></span></span>+<span><span>(<span>−d</span>)</span><span>(<span>3d</span>)</span></span></span></span><span>=<span><span><span><span><span><span>6<span>d^2</span></span>−30</span>+<span>18d</span></span>−<span>d^3</span></span>+<span>5d</span></span>−<span>3<span>d^2</span></span></span></span><span>
=<span><span><span><span> −<span>d3^</span></span>+<span>3<span>d^2</span></span></span>+<span>23d</span></span>−<span>30</span></span></span>
<span>


</span>

6 0
3 years ago
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