Question

What is this number? +1.25 E -19

Answer 1

For this case we have a number written in scientific notation.
By definition we have to:
The use of this notation is based on base powers 10.
A number written in scientific notation follows the following pattern:

`m * 10 ^ e`
The number m is called "mantissa" and e the "order of magnitude"
For this case we have:

`m = 1.25 e = -19`
Using the definition, we have that the number can be rewritten as:

`+1.25 E -19 = 1.25 * 10 ^ {-19}`

`1.25 * 10 ^ {-19} = 0.000,000,000,000,000,000,125`
Answer:
an expression that this number is:

`1.25 * 10 ^ {-19} = 0.000,000,000,000,000,000,125`