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2 years ago

Round each number to the nearest tenth. What is the best estimate for the answer to 471.41 – 397.46? A. 70 B. 73.9 C. 74 D. 74.9

2 answers:

8 0

First you need to subtract 471.41 and 397.46.

471.41 - 397.46= 73.95

The tenths place is the number after the decimal. In number 73.95, the number in the tenths place would be 9. The answer would be C) 74.

(Let me know if you don't understand. I'll try to explain it in more detail.)

Ann [662]2 years ago

5 0

Answer choice: [B] or [C]; could be considered correct; depending on the perspective (explained below).
 Personally, I would go with: Answer choice: [C]: "74" ; because:

1) It's an easier number to "work with" than "Answer choice: [B]: "73.9" ; and:
2) The question asks to "estimate the answer".
____________________________________________________________
One interpretation would be:
______________________________
Consider the math problem given:
________________________________
" 471.41 – 397.46 = ? " ;
_____________________________
And round each of THESE values to the nearest TENTH:
________________________________________________
471.4 – 397.5 = 73.9 ; this answer: "73.9" ; is already rounded to the nearest "tenth"; and does correspond with answer choice: [B].
____________________________________________________
Yet, answer interpretation of this math problem, would be:
____________________________________________________
Given: "471.41 – 397.46 = ?? " ;
________________________________
Solve this problem as it is; and round the actual answer obtained to the nearest "tenth":
___________________________________________
Doing so, we get:
___________________________________________
 "471.41 – 397.46 = 73.95 ." This value, rounded to the nearest "tenth", would be: "74.0" (which is not an answer choice, technically speaking); or "74" (because, in "mathematics", "74.0 = 74"; and we are asked in the problem to "estimate for the answer", so the answer would be:
Answer choice: [C]: 74 .
_____________________________________________________
So, answer choice: [B] or [C]; could be considered correct; depending on the perspective. Personally, I would go with: Answer choice: [C]: "74"; because:
1) It's an easier number to "work with" than "Answer choice: [B]: 73.9" ;
and: 2) The question asks to "estimate the answer".
_____________________________________________

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The amount of oxygen in the flask through the intake tube illustrates proportions

The flask 99.35% will contain of oxygen after 5L have passed through the intake tube

<h3>How to calculate the percentage of oxygen?</h3>

To do this, we make use of the following representations

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So. we have the following derivative

dP = dV - P * dV

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dP/dV = 1 - P

Next, we set up the integral

$\int\limits^x_{0.040} \frac {1}{1 - P}dP= \int\limits^5_0 {dV}$

Integrate both sides

$-\ln(|P - 1|)|\limits^x_{0.04} = 5$

Expand

-ln(|x - 1|) + ln(|0.04 - 1|) = 5

Evaluate the difference

-ln(|x - 1|) + ln(|-0.96|) = 5

Express as a fraction

ln(0.96/|x - 1|) = 5

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x = 1 - 0.96/e^5

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x = 99.35%

Hence, the flask 99.35% will contain of oxygen after 5L have passed through the intake tube

Read more about proportions at:

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1 year ago

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2 years ago

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Answer:

Step-by-step explanation:

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