Question

no calculator
the diameter of a human red blood cell is 0.00065 millimeters. what is that in scientific notation?
o 6.5 × 10³
o -6.5 × 10³
o 6.5 × 10⁻³
o 6.5 × 10²

Explanation:

Step1: Recall scientific notation formula

Scientific notation is \(a\times10^{n}\), where \(1\leqslant|a|\lt10\) and \(n\) is an integer.

Step2: Move decimal point

For \(0.0065\), move the decimal point 3 places to the right to get \(a = 6.5\). Since we moved the decimal point to the right, \(n=- 3\).

Answer:

\(6.5\times10^{-3}\)