Answer:
440 = 2 × 2 × 2 × 5 × 11 = 2³ × 5 × 11
540 = 2² × 3³ × 5
a) GCF = 2² × 5 = 20
b) LCM = 2³ × 3³ × 5 × 11 = 11,880
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