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4 years ago

The estimated population of the world in the middle of 2010 was 6,852,472,823. Express this value in scientific notation.

Mathematics

1 answer:

Marina CMI [18]4 years ago

7 0

First we round it off to the nearest millions.

6,852,472,823 rounded off - 6,852,000,000

then you move the decimal point to the left until the number becomes between 1 and 10

-- 6.852000000

count the numbers to the right of the decimal point, remove the zeroes, then write it as

6.852 x 10^9 or 6.852e9

9 is how many numbers are in the right of the decimal point, which was 852000000

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${ \qquad\qquad\huge\underline{{\sf Answer}}}$

Let's solve ~

Calculate discriminant :

$\qquad \sf \dashrightarrow \: 3 {x}^{2} + 6x - 1$

a = 3
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$\qquad \sf \dashrightarrow \: discriminant = {b}^{2} - 4ac$

$\qquad \sf \dashrightarrow \: d = (6) {}^{2} - (4 \times 3 \times 1)$

$\qquad \sf \dashrightarrow \: d = 36 - 12$

$\qquad \sf \dashrightarrow \: d = 24$

$\qquad \sf \dashrightarrow \: \sqrt {d} = 2 \sqrt{6}$

Now, let's calculate it's roots ( x - intercepts )

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So, the intercepts are :

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2 years ago

Read 2 more answers

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3 years ago

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Answer:

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X bar will have std deviation as $\frac{s}{\sqrt{n} }$

where s is the square root of variance of sample

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Hence as sample size increases, std error decreases.

As the sample size increases, the variability decreases.

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3 years ago

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OLga [1]

Answer:

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3 years ago