Question

here we go

Answer 1

@Zyi6

Answer 2

You have 64 grams of a radioactive kind of radium. How much will be left after 15 years if its half-life is 5 years?

Answer 3

@sethRB26DETT

Answer 4

Do you know which formula you have to apply in order to solve this?

Answer 5

no but I can find out give me a second

Answer 6

P(t) = P0e-rt @Najia2000

Answer 7

Okay. give me a minute, okay?

Answer 8

ok

Answer 9

hope yoou got this @Najia2000 cuz im tapping out lol

Answer 10

dang you let me down @sethRB26DETT

Answer 11

i know im sorry :(

Answer 12

Lol, if you can solve it you should go ahead @sethRB26DETT
Because 2 are always better than 1

Answer 13

ill still tag you though so stay around :p @sethRB26DETT

Answer 14

okai :p

Answer 15

@sethRB26DETT I think you might as well help her, my formulae for this looks like this:
N=N0e^-kt. I don't think the answer would make sense to her.

Answer 16

I can still solve it, but i want it to make sense to @southmini

Answer 17

i cant do it thats why

Answer 18

well solve it and ill make sense of it on my own @Najia2000

Answer 19

@rishavraj
I think he will be able to help you so you understand. ^_^

Answer 20

see all radioactive reactions are 1st order reaction
so
\[t_\{\\frac{\ \1\ \}\{\ \2\ \}\}\ \=\ \\frac{\ ln \2\ \}\{\ lambda \}\ \\]

Answer 21

? not really

Answer 22

the answer was 8 thank for nothing:)

Answer 23

Someone is angry^ Sorry I didn't help out.
The formulae you used , i didn't recognize.

Answer 24

btw, if you don't mind me asking, was this for 9th or 10th grade?

Answer 25

see if u understand....
half life = ln 2/k
k - rate constant
u will get k = 0.138 approx
so \[[A]_{15} = [A]_0\times e ^{-kt} \]

Answer 26

lol naww Im sarcastic thank you guys for real though @Najia2000

Answer 27

this was for 9th grade algebra im in geometry now though @Najia2000

Answer 28

the answer as 8 @rishavraj

Answer 29

yup the answer is 8.....

Answer 30

no I looked up a example and used that to guide my way

Answer 31

@rishavraj

Answer 32

okay .....cool:))))

Answer 33

could you ttry this one I wanna see if we get the same answer The number of research papers in Dr. Howell's area of expertise has been increasing by 5% every year. Given that 17,760 research papers were published this year, how many will be published 9 years from now @rishavraj

Answer 34

@tom99 could you this question a shot

Answer 35

whts ur answer???@southmini

Answer 36

@rational 27552

Answer 37

yup approx tht

Answer 38

i got like 27551.63

Answer 39

round to the nearst whole number is what it says

Answer 40

@rishavraj

Answer 41

http://www.wolframalpha.com/input/?i=17760%281%2B0.05%29%5E9

Answer 42

I got the same thing too, but i got it using my formula.
@southmini

Answer 43

@Najia2000 congrats on ur grand success.......lol.....go celebrate....xDD

Answer 44

@rishavraj Shutup! :p

Answer 45

:) @rishavraj lol

Answer 46

@southmini -_-

Answer 47

well excuse me @rishavraj

Answer 48

@rishavraj http://buymelaughs.com/wp-content/uploads/2013/12/Funny-memes-11.jpg

Answer 49

@Najia2000 oo really bring it on....lol..xD

Answer 50

Ok, bye.