Answer :
Answer:56Step-by-step explanation:7k²=21952
k²=21952/7
k²=3136
k=√3136
k=56
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ANSWER: The valid answer is 56
EXPLANATION:
7k^2=21952
Step 1} k^2=21952/7
Step 2} k^2=3136
Step 3} k=√3136
Step 4} k=56
Therefore, the answer is 56.