Compute 4.659×104−2.14×104. round the answer appropriately.
express your answer as an integer using the proper number of significant figures (e. g. 12300)

25,200.

Explanation:

1) Given: 4.659 × 10⁴ - 2.14 × 10⁴

2) You have to deal with significant figures.

Since, the powers are the same (10⁴) you can directly subtract the decimal numbers. But first analyze the significant figures and the number of decimal digits.

3) The number 4.659 × 10⁴ has four significant figures (4, 6, 5, and 9), while the number 2.14 × 10⁴ has three significan figures (2, 1, and 4).

4) When you add or subtract numbers with diferent amount of decimal digits, the result must show the same number of decimal digits as the term with the least number of decimal digits.

5) Before subtracting, you must round all the terms to the least number of decimal digits. So, since 2.14 has two decimal digits and 4.659 has three decimal digits, you shall round 4.659 to 4.66.

6) Now you subtract 4.66 - 2.14 = 2.52

7) Multiply by the power of 10: 2.52 × 10⁴ = 25,200. And that is the answer.

The result is 25200

4.659 minus 2.14 will produce 3 significant number  referring to a number that has the smallest significant number value of 2.14

Significant numbers are numbers obtained from the measurement results of exact numbers and the last number estimated  

In scientific notation, all numbers are displayed before the big order is called significant numbers  

the scientific notation can be described as:  

a, ... x 10ⁿ  

a, ... called an significant numbers  or mantissa

10ⁿ is called a big order  

Rules for significant numbers in general:  

In the question it is known that  

(4,659 × 10⁴) and (2.14 × 10⁴) both have a significant number in a row 4,659 and 2.14 so that it meets the rule of significant numbers   5 which is 4 and 3 significant number  

So 4.659 minus 2.14 will produce 3 significant number  (because we are referring to a number that has the smallest significant number value of 2.14)

So that we do the significant number/coefficient then proceed a big order  

Because it has the same exponent number, then the coefficients can be directly deducted, except if the exponent number is different then it must be converted first

4.659 - 2.14 = 2.519

So the result = 2.519 . 10⁴

Because the result must have 3 significant number , the result is 25200 (2 zeros behind is not a significant number)

significant figures  

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significant figures in the following number: 5.67 x 106  

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the number of significant figures is 0.025  

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0.080 significant figures  

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the fewest number of significant figures  

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Keywords : significant number, scientific notation, the exponent number

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number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

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