3 years ago

How long will it take for 750 mg of a sample of radium-225, which has a half-life of about 15 days, to decay to 68 mg?

Mathematics

1 answer:

AleksAgata [21]3 years ago

6 0

Answer:

52 Days

Step-by-step explanation:

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A book is 0.33 meters long. How many millimeters long is it?

Phoenix [80]

we know that

$1\ meter=1,000\ millimeters$

by proportion

Find how many millimeters are in $0.33$ meters

$\frac{1,000}{1} \frac{mm}{m} =\frac{x}{0.33} \frac{mm}{m} \\ \\x=1,000*0.33 \\ \\ x=330\ mm$

therefore

<u>the answer is</u>

$330\ mm$

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3 years ago

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Elena L [17]

Answer:

31,536,000

Step-by-step explanation:

There are 3600 seconds in an hour and 24 hours in a day, so ...

(3600 s/h)(24 h/da) = 86400 s/da

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(365 da)(86400 s/da) = 31,536,000 s

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No rounding is needed.

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3 years ago

A drawer contains unmatched socks. There are 7 black, 4 blue, and 5 white. What is the probability that you will select a white

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Step-by-step explanation:

8.3

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3 years ago

Add (13x – 4) and (–6x + 15)

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(13x – 4) + (–6x + 15) =

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3 years ago