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kow [346]
3 years ago
10

The sum of 21 and a number is 30

Mathematics
1 answer:
vagabundo [1.1K]3 years ago
5 0
The answer is 9, because you subtract 21 from 30 and you get 9. When you add 21+9 you get 30.
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The formula T= 2pi sqrt(L/32) relates the time, T, in seconds for a pendulum with the length, L, in feet, to make one full swing
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