someone please help
The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. Starting with
135 grams of a radioactive isotope, how much will be left after 4 half-lives?

Question

someone please help 
The half-life of a radioactive isotope is the time it takes for a quantity of the isotope to be reduced to half its initial mass. Starting with 
135 grams of a radioactive isotope, how much will be left after 4 half-lives?

welshfella · Answer

after  first half life it will have a mass of 1/2 * 135

- etc  for another 3 half lives

anonymous · Answer

oay am i just dividing

anonymous · Answer

the ANSWER WAS 8 ... NEW QUESTION
An amount of $24,000 is borrowed for 14 years at 6.5%
 interest, compounded annually. If the loan is paid in full at the end of that period, how much must be paid back?

anonymous · Answer

@songgirl1234 @butterflydreamer @iGreen

anonymous · Answer

@horsegirl325 @Ineedhelpfast12 @barce_messi10

anonymous · Answer

135/2    =67.5   1 half
67.5/2=33.75     2
33.75/2=16.875   3
16.875/2 =8.4 375 grams

anonymous · Answer

I already solved that one , the answer was just 8 , it;s the next question but i thank u so much

anonymous · Answer

YW

anonymous · Answer

can u help me with the last one

anonymous · Answer

Compound Interest Formula 
A= P(1+r/n)^(nt)

anonymous · Answer

okay