What is the modulo $13$ residue of $247+5 \cdot 39 + 7 \cdot 143 +4 \cdot 15?$
Question:
What is the modulo $13$ residue of $247+5 \cdot 39 + 7 \cdot 143 +4 \cdot 15?$
Answer:
Let's think step by step.

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What is the modulo $13$ residue of $247+5 \cdot 39 + 7 \cdot 143 +4 \cdot 15?$
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