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Sagot :
A cellphone could not possibly weigh as little as 0.0028 or as much as 2.8 or 28 pounds.
Therefore, the most reasonable value for n is -1, the correct option is B.
Given
A cell phone weighs about [tex]\rm 2.8\times 10^n[/tex] pounds.
What is scientific notation?
Scientific notation is a form of showing the numbers that are too big or too short (long string) will be written in decimal form.
1. When the value of n is -3.
[tex]\rm =2.8\times 10^n\\\\\rm =2.8\times 10^{-3}\\\\=2.8\times \dfrac{1}{1000}\\\\=0.0028[/tex]
2. . When the value of n is -1.
[tex]\rm =2.8\times 10^n\\\\\rm =2.8\times 10^{-1}\\\\=2.8\times \dfrac{1}{10}\\\\=0.28[/tex]
3. When the value of n is 0.
[tex]\rm =2.8\times 10^n\\\\\rm =2.8\times 10^{0}\\\\=2.8\times1 \\\\=2.8[/tex]
4. When the value of n is 1.
[tex]\rm =2.8\times 10^n\\\\\rm =2.8\times 10^{1}\\\\=2.8\times 10 }\\\\=28[/tex]
A cellphone could not possibly weigh as little as 0.0028 or as much as 2.8 or 28 pounds.
Therefore, the most reasonable value for n is -1.
To know more about Scientific notations here :
brainly.com/question/3112062
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