Question

USA scientific notation to express the diameter of a red blood cell that measures 0.00075 centimeters

Answer 1

Answer:

$7.5 * 10^{-4}$

Step-by-step explanation:

Scientific notation is basically taking a decimal number and writing it as the product of a number between 1 and 10 (including 1 but excluding 10) and a power of 10.

Here, to get a number between 1 and 10, we see that 7.5 could work. However, if we have 7.5, we're disregarding all the zeros that came before it, which can't work. So, we need to take those into account by dividing 7.5 by 10000, which is the same as multiplying 7.5 by $10^{-4}$.

Thus, our final answer is the scientific notation: $7.5 * 10^{-4}$.

Answer 2

Answer: 7.5×10^-4

Step-by-step explanation:

0.00075

Scientific notation means standard form

There are 3 zeros in front of the 7

So take the decimal to the back of 7

You have

7.5

Since you are counting backward, it will be negative

So we have

7.5×10^-4