Answer :

konrad509
[tex]\frac{1}{4}(k-1)=10\\ k-1=40\\ k=41[/tex]
mariamikayla
[tex]\frac{1}{4}(k-1)=10^{(4} \\\\ k-1=40 \\\\ k=40+1 \\\\ \boxed{k=41} [/tex]

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