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Lena [83]
3 years ago
9

Please help me with this!

Mathematics
1 answer:
trapecia [35]3 years ago
5 0
Divide 130 by 3 i think
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3 years ago
Serena is making an experiment. For that, she needs 20 grams of a 52% solution of salt. She has two large bottles of salt water:
Fudgin [204]
X + y = 20 --> eqn 1
The second equation would be the mass balance shown below:
(x)(0.40) + y(0.70) = 20(0.52) --> eqn 2
Rearranging eqn 1,x = 20 - ySubstitute this to eqn 2:
(20 - y)(0.40) + y(0.70) = 20(0.52)Solve for y,y = 8 grams Finally, solve for x.x = 20 - 8 = 12 grams
Therefore, Serena needs 12 grams of the 40% solution and 8 grams of the 70% solution.
 
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3 years ago
Find f(-2)for f(x)=5*3^x
damaskus [11]

f ( - 2 ) = 5 × 3^( - 2 )

f ( - 2 ) = 5 × 1/9

f ( - 2 ) = 5/9

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3 years ago
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DiKsa [7]

Answer:

8.40049 × 10^7

Step-by-step explanation:

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3 years ago
IM BEGGING YOU PLEASE HELP I WILL GIVE BRAINLIEST!!!!
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