Question
Asked Feb 29, 2020
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You have an original cell density of 4.3 x 10^8 CFU/mL. What is this number in its non-scientific notation or "regular" format?

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Expert Answer

Step 1

Scientific notation is used in a standard way of writing very large and very small numbers so that they are easier to both compare and use in computations. To write in scientific notation, follow the form

Biology homework question answer, step 1, image 1

Where N is a number between 1 and 10, but not 10 itself, and a is an integer (positive or negative number).

Step 2

In the given question colony forming unit (CFU) is used to determine the number of bacteria in the sample. So in this question number of bacteria is

Biology homework question answer, step 2, image 1CFU/mL

That is actually 430000000 bacteria in 1 ml.

1) Move the decimal place to the left to create a new number from 1 up to 10. So N is 4.3.

2) Now determine the exponent, which is the number of times you moved the decimal from 430000000 to 4.3. In this, you moved the decimal 8 times; also, because you moved the decimal to the left, the exponent is positive. Therefore, a = 8, and...

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