Superscripts, Subscripts, And Level Indicators

1. The appropriate level indicator must be used before a superscript or subscript to the left of its related sign.
   1. ³x
      

   2. ⁿx
      

   3. ^-2 + ^-4 = ^-6
      

   4. ⁺m - ^-n = ⁺(m +n)
      

   5. (^-2, ^-1, 0, ⁺1, ⁺2)
      

   6. (-3)^{-2+ +2}
      

   7. ₃P₂
      

   8. ₄₈C₉ x ₄C₄
      

   9. _nP_r=K(_n-1P_r-1)
      

   10. _yxn
       

   11. _xyn
       

2. The appropriate superscript indicator must be repeated before a left-superscript when two superscripts are consecutive, but one applies to the expression preceding it and the other to the expression following it.
   1. p^{b c}q
      

3. The subscript indicator must be used before a left-subscript when two subscripts are consecutive, but one applies to the expression preceding it and the other to the expression following it.
   1. P_{b c}Q
      

   2. P_{1 2}Q
      

4. When a left-superscript is shown with a single-letter abbreviation, the English letter indicator is not used.
   1. 19,872,369 °C
      

   2. 10^-23° F