13. There were 120 books on shelf last month, and there are currently 250 books on shelf this month.
1 answer:
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Answer:
a = 64
Step-by-step explanation:
The geometric mean of 2 numbers a and b is , then
= 16
( square both sides )
28a = (16 )² = 1792 ( divide both sides by 28 )
a = 64