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Otrada [13]
3 years ago
7

One person can do a certain job in twenty-one minutes, and another person can do the same job in twenty-eight minutes. How many

minutes will it take them to do the job together?
6 min
12 min
24 min
Mathematics
2 answers:
jenyasd209 [6]3 years ago
7 0
\dfrac{1}{21}+\dfrac{1}{28}=\dfrac{1}{x}\\
\dfrac{4}{84}+\dfrac{3}{84}=\dfrac{1}{x}\\
\dfrac{7}{84}=\dfrac{1}{x}\\
7x=84\\
x=12
Zigmanuir [339]3 years ago
5 0

Answer:

12 minutes

Step-by-step explanation:

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A concession stand serves hot dogs and hamburgers at a ratio of 3 to 2. Based on this ratio, how many hamburgers will be served
Makovka662 [10]

Answer:

no clue i need help on this

Step-by-step explanation:

HOWWWW DOOOO YOUUUU DOOOOOO THISSS!?!?!?!?!!?!??!!??!?!!??!!??!?!

7 0
2 years ago
3 csc^2(2x) + 2 cosec 2x = 1-cot^2(2x)
asambeis [7]

I am assuming you want to solve for x:-

Now cosec^2 2x = 1 - cot^2 2x  so the equation becomes

3 cosec^2(2x) + 2 cosec 2x =  cosec^2 2x

2 cosec^2 2x + 2 cosec 2x = 0

2 cosec 2x (  cosec 2x + 1) = 0

so 2 cosec 2x = 0  or    cosec 2x = -1

cosec 2x = 0  or cosec 2x = -1

cosec 2x = 0  is indeterminate so we ignore the first one

cosec 2x = -1  can be written as 1 / sin 2x = -1

so sin 2x = -1  

giving 2x = 270 degrees

Therefore  x = 135 degrees  answer


3 0
3 years ago
Need help on this too​
andrezito [222]

Answer:

I think it is distributive

Step-by-step explanation:

When a single number is next to parentheses, it's called distributive property

I hope this is right :/

Please mark brainliest :/

6 0
2 years ago
I need help with math! ASAP picture tagged
GalinKa [24]
Offer 2 is the best.

To find how much you get off of each car, multiply the amount by the fraction. For offer 2, do £11 100×⅓ and you should get 3700.

For offer 3 do £9600×¼ and you get 2400.

Since you get the most money off with offer 2, that would be the best offer.

Hope this helps :)
6 0
3 years ago
Divide 18 by 6 then add 4 then multiply by 8
xxTIMURxx [149]
The answer will be 56 :>
7 0
3 years ago
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