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In this fragment from an equation solution the backtick is used twice:

inputs = {HoldForm[
    Solve[Quantity[2.2`*^12, "Joules"] == 
      1/2 (Quantity[68000.`, "Kilograms"])*v^2, v]], 

I thought the backtick was used to make context variables? Is it supposed to be a precision marker or something? Does 2.2` mean "I want the answer only in one decimal place"? I don't understand how/why the backtick is being used here.

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  • $\begingroup$ @m_goldberg I read that post. It does not answer my question. $\endgroup$ Apr 28, 2014 at 15:44
  • $\begingroup$ Why not? What you show is a number mark. $\endgroup$
    – m_goldberg
    Apr 28, 2014 at 15:45
  • $\begingroup$ First of all the question is different (obviously). In the one answer the most relevant thing says "As a number mark to mark the end of an approximate number, and separate the number from its precision value." There are no precision values in the expression above, so I am no closer to understanding why the backtick is being used. $\endgroup$ Apr 28, 2014 at 15:48
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    $\begingroup$ @m_goldberg probably meant this Q/A... $\endgroup$
    – kglr
    Apr 28, 2014 at 15:55
  • $\begingroup$ @kguler. That is a better choice for "duplicate of" than the question I chose. $\endgroup$
    – m_goldberg
    Apr 28, 2014 at 15:58

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