For a non-zero rational number a, a7 ÷ a12 is equal to
(a) a5
(b) a−19
(c) a−5
(d) a19
$a^{m} \div a^{n}=a^{m-n}$
Hence,
$a^{7} \div a^{12}=a^{7-12}=a^{-5}$
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