Question 1203374
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As  I  (and other tutors)  see this format in your post  " 1:5 × 10 to the power nine ",  it seems strange.


A normal writing is  (probably)  " 1.5 × 10 to the power nine ".  It is how me  (and other tutors)  read it.



        So,  we all read it differently from what we see.
                 It is just bordering with a crime.



        (By the way, it is you who pushes us to this crime)



But what your writing actually means,  we do not know and can not know,  since you use non-standard format.


            (It is the same as if you use chines' hieroglyphs)



                                We can only guess.



In  Math,  every word,  every symbol and every punctuation sign does matter.



                    And if some post contains non-standard formatting, 

         it should be rejected,  strictly saying,  and reported up to the instance.



So,  my question is:  from which source did you re-write your number
and what,  ACTUALLY,  is written in that source ?