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12) Hasil  dari  ( 34 - 18 )² - 7²
                     =  ( 16 )² - 7²
                     =   256 - 49
                     =  207 (C)

13) Hasil dari ∛6.859
                    = ∛19 x 19 x 19 
                    = 19 (C)

14) Volume = rusuk³
      64.000  = rusuk³
    ∛64.000 = rusuk
              40 = rusuk (C)

12.)
(34-18)²-7²
=16²-7²
=256-49
=207

13)
[tex] \sqrt[3]{6859} [/tex]
=19

14) Volume kubus =s³
64000=s³
s=
[tex] \sqrt[3]{64000} [/tex]
=40 cm