If a bacterial cell has a length of 0.9 micrometers (µm), how many nanometers (nm) long is the cell?

900 nanometer (nm)

Explanation:

Given that,  

Length of a bacterial cell = 0.9 micrometer (µm)

There is a direct relationship between the nanometer and the micrometer scale,

It is that 1 micrometer (μm) = 1000 nanometer (nm)

Therefore, 0.9 μm = 900 nm

Thus, the length of the given bacterial cell is 900 nanometer (nm).

multiplying and dividing the two decimals and the eqations by the same number of the overalls