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poizon [28]
3 years ago
11

What time is 7 1/2 hours before 2:12 am

Mathematics
1 answer:
Vlad1618 [11]3 years ago
4 0
6:42 pm bc subract 2 hours is 12:12am and then subtract the rest is 7:12pm then you subract 12 minutes is 7 pm the subtract the 18 minutes left is 6:42 pm
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Recall that m(t) = (1/2)^t/h for radioactive decay, where h is the half-life. Suppose that a 500g sample of phosphorus-32 decays
katrin2010 [14]

The question is incomplete, here is the complete question:

Recall that m(t) = m.(1/2)^t/h for radioactive decay, where h is the half-life. Suppose that a 500 g sample of phosphorus-32 decays to 356 g over 7 days. Calculate the half life of the sample.

<u>Answer:</u> The half life of the sample of phosphorus-32 is 14.28days^{-1}

<u>Step-by-step explanation:</u>

The equation used to calculate the half life of the sample is given as:

m(t)=m_o(1/2)^{t/h}

where,

m(t) =  amount of sample after time 't' = 356 g

m_o = initial amount of the sample = 500 g

t = time period = 7 days

h = half life of the sample = ?

Putting values in above equation, we get:

356=500\times (\frac{1}{2})^{7/h}\\\\h=14.28days^{-1}

Hence, the half life of the sample of phosphorus-32 is 14.28days^{-1}

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3 years ago
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Mila [183]

Answer:

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Step-by-step explanation:

If the given triangles ΔABC and ΔDEF are similar,

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By substituting the measures of the given sides,

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Since, corresponding sides of both the triangles are proportional, both the triangles will be similar.

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Step-by-step explanation:

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Answer:

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Brittany goes out for lunch to the local sandwich shop. She can choose white or
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Answer:

There are 6 sandwich choices.

Step-by-step explanation:

2*3=6

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