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March 31, 2015

March 31, 2015

Posted by **Jen** on Thursday, December 13, 2012 at 4:54am.

- Intermediate college algebra -
**Reiny**, Thursday, December 13, 2012 at 9:34amI find dumb and cutesy word problems like this very irritating, and will not answer them.

Tell your teacher to give you problems that are meaningful and serve a purpose.

- Intermediate college algebra -
**Steve**, Thursday, December 13, 2012 at 10:34amespecially since you have to go look up the half-life of

^{226}Ra, which is 1601 years

however, I'm both bored and not proud, so here goes:

v = 648π*(1/2)^(4860/1601) =~ 79π

h/r = w = 3

πr^2*h = 79π

πr^2(3r) = 79π

3r^3 = 79

r = 2.98

a = 2πr(r+h) = 2π*2.98(2.98*4) =~ 71π

- Intermediate college algebra -
**Steve**, Thursday, December 13, 2012 at 10:36amI see that the radium decay is suspiciously close to 3 half-lives.

If that was what was wanted, then

v = 81π

r = 3

a = 72π

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