19[10] was on my assignment. I do not understand what it is asking.

It doesn't make sense to me.

it might mean that you are supposed to multiply them together.

The notation is poor, I would interprete according to the rest of the question.   

Can you put the whole page please? Or the whole question? That may help.

This online system will recognize scientific notation IF you enter it the same way your calculator does. For example: 

273,000 = 2.73E5 

Remember you only need to keep three digits in your answer. 

4.387652289E-3 could be entered as 4.39E-3 

Complete the following calculation and then write your answer in the box using scientific notation. 

19[10] = ????

That is the question