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Lerok [7]
3 years ago
6

What do i do?? i just have to find what the the question marks show.

Mathematics
1 answer:
lina2011 [118]3 years ago
4 0
------------------------------------------------------
Given information
------------------------------------------------------
100%  = $27.60

------------------------------------------------------
Rewriting it
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\$27.60 = 100 \%
\$1 = 100 \div 27.60 \%
\$1 =  \frac{250}{69} \%

------------------------------------------------------
Find $4.14 in percentage
------------------------------------------------------
\$1 = \frac{250}{69} \%
\$4.14 =  \frac{250}{69}  \times 4.14
\$4.14 = 15%

------------------------------------------------------
Answer: 15%
------------------------------------------------------


------------------------------------------------------
Find $31.74 in percentage
------------------------------------------------------
\$1 = \frac{250}{69} \%
\$31.74 = \frac{250}{69} \times 31.74
$31.74 = 115%

------------------------------------------------------
Answer: 115%
------------------------------------------------------
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Answer:

the concentration at 10 minutes= 0.4+0.0133= 0.4133%

Step-by-step explanation:

Air containing 0.04% carbon dioxide

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so, its take 3mins for air to be completely filled in the room and for exhaust air to move out.

there is  an initial concentration of 0.4% carbon dioxide, and the air pump in is 0.04%.

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3*60 =180sec = 0.04%

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the concentration at 10minutes = the concentration for 1minute because at every minutes, the concentration moves in is moves out. = concentration for 2000ft3.

for 0.04% = 6000ft3

   ?          = 2000ft3

              = 2000* 0.04)/6000 =0.0133%

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