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Natalija [7]
3 years ago
14

Can someone help with this ASAP

Mathematics
1 answer:
LenKa [72]3 years ago
3 0

Answer:

x=7cm.

Step-by-step explanation:

A=1/2(a+b)h.

63=1/2(6+12)x.

63=1/2(18)x.

63=9×x.

63/9=9×x/9.

7cm=x.

x=7cm.

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