Posted by Anonymous on Wednesday, July 20, 2011 at 9:51am.
The halflife of 234U, uranium234, is 2.52 105 yr. If 97.7% of the uranium in the original sample is present, what length of time (to the nearest thousand years) has elapsed?

algebra  bobpursley, Wednesday, July 20, 2011 at 10:55am
.977=e^(.693T/thalf)
take the ln of each side, solve for T 
algebra  lance, Friday, December 16, 2011 at 2:46pm
The halflife of 234U, uranium234, is 2.52 105 yr. If 98.4% of the uranium in the original sample is present, what length of time (to the nearest thousand years) has elapsed?

algebra  Anonymous, Saturday, April 28, 2012 at 12:15pm
The halflife of 234U, uranium234, is 2.52 105 yr. If 98.2% of the uranium in the original sample is present, what length of time (to the nearest thousand years) has elapsed