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kirill115 [55]
2 years ago
14

Help me please and thank you

Mathematics
1 answer:
givi [52]2 years ago
5 0

Since the shape is a parallelogram, there are 2 pairs of opposite but equal sides --> "6a+21" and "20a+7"                   "11a" and "4a+7"

The easier pair is

11a = 4a+7              Subject 4a from both sides

7a = 7                     Divide 7 from both sides

a = 1

A = 1    

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