Answer:
46 ≥ 2m + 4
m ≥ 21
Explanation:
At least is ≥
Karen's age = 46 years old
Mary's age = m years old
Karen is at least 4 years more than twice mary's age (m).
46 - 4 ≥ 2m
42 ≥ 2m
m ≥ 42/2
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