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777dan777 [17]
3 years ago
14

Estimate 462809 + 256738

Mathematics
1 answer:
mafiozo [28]3 years ago
5 0
462809 round off to 500000.
256738 round off to 300000.
500000+300000=800000
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The diameter of cold virus cell is about 3x10-9 meter,and the diameter of a streptoccus bacterium cell is about 9x10-7 meter. Wh
Archy [21]

Here we need to compare the orders of magnitude of two measures.

We will see that the bacteria is<em> 300 times larger than the virus.</em>

We know that:

The diameter of the virus-cell is:

D_v = 3 \cdot 10^{-9} m

The diameter of the bacteria cell is:

D_b = 9 \cdot 10^{-7} m

So, to compare them, first notice that both are in the same units, meters, so we only need to <u>compare the numbers</u>.

Is common sense to identify the one with the largest exponent as the largest number, and the largest exponent is -7, thus <u>the bacteria should be the larger one.</u>

But let's prove this with math, remember the property:

\frac{a^n}{a^m} = a^{n - m}

Let's take the quotient between the diameters and see what we get, I will use the <u>diameter of the bacteria in the numerator</u>, thus <u>if the quotient is larger than 1, it would mean that the bacteria is greater and by how much.</u>

quotient = \frac{ 9 \cdot 10^{-7} m}{ 3 \cdot 10^{-9} m}  = \frac{9}{3} \cdot 10^{-7 + 9}\\\\= 3*10^2

So we can say that the bacteria is 3*10^2 = 3*100 = 300 times larger than the virus.

If you want to learn more, you can read:

brainly.com/question/4953281

8 0
2 years ago
Carbon-14 tests are often performed to determine the age of an organism that died a long time ago. Carbon-14 has a half-life of
Crank

Answer:

2006 years old.

Step-by-step explanation:

If it had 50% of its carbon-14 it would be 5730 years old.

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wolverine [178]

Answer:

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Step-by-step explanation:

8 0
3 years ago
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A and E
Just rearrange where the -5 is
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3 years ago
NEED HELP ASAP FOR HOMEWORK!! IF RIGHT WILL MARK BRAINLIEST!!!​
alexdok [17]

Answer:

It's the 3rd one using the formula a^{-m} = \frac{1}{a^{m} }

Once you follow that step you need to multiply the exponent of 3 and 6 with the exponent outside the parenthesis..... which is why it's the 3rd one.

4 0
3 years ago
Read 2 more answers
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