We need to find which of the expressions does not have a two digit quotient.
The only expression which does not have a two digit quotient is [tex]\dfrac{915}{7}[/tex].
Let us check each expression
[tex]\dfrac{519}{6}[/tex]
Dividing each by three
[tex]\dfrac{173}{2}=86.5[/tex]
So, the quotient is betweem 86 and 87.
[tex]\dfrac{915}{7}[/tex]
[tex]7\times 130=910[/tex]
[tex]7\times 131=917[/tex]
So, the quotient will lie between 130 and 131.
[tex]\dfrac{439}{7}[/tex]
[tex]7\times 62=434[/tex]
[tex]7\times 63=441[/tex]
So, the quotient will lie between 62 and 63.
[tex]\dfrac{812}{9}[/tex]
[tex]9\times 90=810[/tex]
[tex]9\times 91=819[/tex]
So, the quotient will lie between 90 and 91.
Hence, the only expression which does not have a two digit quotient is [tex]\dfrac{915}{7}[/tex].
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