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Len [333]
3 years ago
15

What is 81 rounded to the nearest ten?

Mathematics
2 answers:
babunello [35]3 years ago
8 0

Answer:

80

Step-by-step explanation:

tekilochka [14]3 years ago
4 0

Answer:

80

Step-by-step explanation:

Think of it like a hill

Anything 5 and under goes to 0

Anything above 5 influences the next number

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For a first order decay, fraction remaining = 0.5n where n = number of half lives elapsed.

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b)  0.15 = 0.5n

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n = 2.74 half lives

2.5 billion years/half life x 2.74 half lives = 6.85 billion years = age of rock

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