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aksik [14]
3 years ago
9

217.72 million in scientific notation

Mathematics
1 answer:
zepelin [54]3 years ago
7 0

2.17720 × 10^2 is the answer

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7.96 rounded to the nearest tenth
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Write as an inequality 9 is greater than or equal to w, and -7 is less than or equal to w
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The mass of a radioactive substance follows a continuous exponential decay model, with a decay rate parameter of per day. Find t
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Answer:

t = ln(0.5)/-r

Step-by-step explanation:

The decay rate parameter is missing. I will assume a value of 4% per day.

The exponential decay is modeled by the following equation:

A = A0*e^(-r*t)

where A is the mass after t time (in days), A0 is the initial mass and r is the rate (as a decimal).

At half-life A = A0/2, then:

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t = 17.33 days

In general the half-life time is:

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3 years ago
HELP ME OUT PLEASE!!
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Write these steps down

Positive times positive=positive
Negative times positive=negative
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when any two numbers that are negative it will always equal a positive.
Its a rule for math.
5 0
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