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Sphinxa [80]
3 years ago
8

Please help me thanks please

Mathematics
1 answer:
MariettaO [177]3 years ago
6 0
Answer : 45 centimeters
Explanation: 756 = ((a+b)/2)h
756 = ((39+b)/2)18
756/18 = (39+b)/2
42= (39+b)/2
2(42) = 39 + b
84 = 39+b
84-39=b
45=b
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