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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.