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Answer:
1. 30 cm
2. 210 cm
3. 420 cm
4. 10.5 cm
Step-by-step explanation:
1. explanation 2.5cm x 12cm = 30 cm
2. explanation 7 cm x 30cm = 210 cm
3. explanation 14 x 30 = 420 cm
4. explanation 21 ÷ 2 = 10.5