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valina [46]
3 years ago
15

What is rationalising factor?

Mathematics
1 answer:
Likurg_2 [28]3 years ago
8 0
Rationalizing Factor<span> is defined as a homogenous quadratic function of a mathematical symbol. </span>
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What is the average (arithmetic mean) of the first 90 measurements in a certain list of 92 measurements? (1) the average of the
marishachu [46]
The sum of all the measurements is just the average times the number.

\bar x = \frac{1}{n} \sum_{i=1}^n x_i

\sum_{i=1}^n x_i = n \bar x

So if the average of all 92 is 7 the sum of those is 92 \times 7

The average of the last two is 7.2 so their sum is 2 \times 7.2

That means the sum of the first 90 is 92 \times 7 - 2 \times 7.2

so the average of the first 90 is

 \dfrac{92 \times 7 - 2 \times 7.2}{90} = 6.99556 cm



7 0
3 years ago
Write the following expression in standard for a + bi<br><br><img src="https://tex.z-dn.net/?f=%5Cfrac%7B6-i%7D%7B1%2Bi%7D" id="
Arte-miy333 [17]

Answer:

5/2-7/2 i or 2.5-3.5i

Step-by-step explanation:

expand the fraction remove the parenthesis and then calculate

3 0
2 years ago
Can someone please help me this is due in 10 mins
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<h2>Answer: 250 Hamburgers sold</h2><h2>Step-by-step explanation:</h2><h2><u><em>x = hamburgers </em></u></h2><h2><u><em>y = cheeseburgers </em></u></h2><h2><u><em>x+y=434 </em></u></h2><h2><u><em>66 fewer cheeseburgers than hamburgers </em></u></h2><h2><u><em> </em></u></h2><h2><u><em>  </em></u></h2><h2><u><em>y = x - 66 </em></u></h2><h2><u><em>Substitute y into the first equation </em></u></h2><h2><u><em>x + (x-66) = 434 </em></u></h2><h2><u><em>2x = 434 + 66 </em></u></h2><h2><u><em>2x = 500 </em></u></h2><h2><u><em>x = 250 hamburgers sold</em></u></h2>
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3 years ago
-3(-x - 7)<br><br> (Distributive property)
baherus [9]
I believe it is 3x+21 but i could be wrong :/ my explaination is -3 • -X would be +3x because it was distributed and -3 • -7 would be +21
5 0
3 years ago
Zinc has a density of 0.258 lb/in³ (pounds per cubic inch).
Gemiola [76]

Why don’t you round the last answer

8 0
3 years ago
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