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Mathematics 8 Online
OpenStudy (anonymous):

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OpenStudy (anonymous):

Well, A and C are obviously not the answer. Because 1090/15 can never be the same as 1090 Also if it takes 72 minutes for 1 heartbeat, you'd be pretty dead. (Normally you have a little more than 1 heartbeat every second) B is pretty much the same problem as C, So that only leaves one option.

OpenStudy (anonymous):

its d

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