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3 years ago

5

Why do scientists use scientific notation science

1 answer:

grandymaker [24]3 years ago

5 0

Because it makes quantities with a lot of digits small enough that you can do math with them.

example:
say you measure a wavelength in nanometers which is common for wavelengths but then have to use this quantity in an equation with the speed of light; 300,000,000 m/s ..
You then must convert one of these quantities to get both in the same units of measure. Usually you would write 600 nm as 6x10^11 m instead of a 12 digit decimal and speed of light as 3x10^8 m/s

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3 years ago

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aul bought 9 total shirts for a total of $72. Tee shirts cost $10 and long sleeve shirts cost $7. How many of each type of shirt

vodomira [7]

Set up a system of equations:

$\text{Total shirts bought}$

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$\text{Total cost}$

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x represents how many tee shirts were bought, and y represents how many long sleeve shirts were bought.

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$10 \times -y = -10y$

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Combine like terms:

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Now you have a value for y. Input this value into the first equation:

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Subtract both sides by 6 to get x by itself:

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3 years ago

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