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Firdavs [7]
3 years ago
11

Gabe Amodeo, a nuclear physicist, needs 60 liters of a 40% acid solution. He currently has a 30% and a 60% solution. How many li

ters of each does he need to make the needed 60 liters of 40% acid solution?
Mathematics
1 answer:
Oksana_A [137]3 years ago
3 0
You have to add them the find the reciprocal and divided to find the width then turn it to a fraction them multiply and subtract again and find your answer
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An EPA contractor needs to test the concentration of a substance in ten samples of the ground water. Seventy samples were
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Answer:

Systematic sampling

Step-by-step explanation:

An EPA contractor needing to test the concentration of a substance in ten samples out seventy samples provided form a single source at regular time intervals.

For the contractor to effectively carry out the testing he has to employ a Non-probability system of sampling which is called Systematic sampling, because in systematic sampling we can assume the population size (x ) which in this case is 70 and the sample size( n ) to be 10

He will have to select ;  ( x / n )^th of the sampling frame for best results

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A(x+y)-a(x-y) simplified .
Keith_Richards [23]

Answer:

2ay

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a(x+y)-a(x-y)

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