Question

dumbcow I need help Please!, I attach file ,just set up equation do not solve

Answer 1

which question?

Answer 2

all

Answer 3

just write equation, do not solve

Answer 4

23) N is number hairs on head, d is num of days
\[N = 1,400,000 -75d\]
\[\rightarrow d = \frac{1,400,000-N}{75}\]
convert days to years
24)
Not sure, do they give decay equation for carbon14?

25)
half-life means half the initial value of a
\[\frac{1}{2} = e ^{-.0856t} \rightarrow \ln \frac{1}{2} = \ln e ^{-.0856t}\]

Answer 5

25?

Answer 6

y=1/2?
t=?

Answer 7

yes set y = a/2, a cancels out, solve for t

Answer 8

23) N =?

Answer 9

num of hairs left on head, for this problem N = 1000, solve for d

Answer 10

ok, 24) u knpw equation or formular?

Answer 11

i dont know decay function for carbon14

Answer 12

let me send u a lesion ,note for this question

Answer 13

ok, its similar to 25) just set it equal to 1/12 instead of 1/2 and solve for time

Answer 14

OK, I will try to solve ,Thank

Answer 15

?

Answer 16

necer mind i know

Answer 17

thank

Answer 18

23) F ?

Answer 19

correct

Answer 20

on 24 ) say dinosaurs live from 220 million to 63 million years ago

Answer 21

right, so is it likely the bone is from a dinosaur
i was able to find that the half-life of carbon-14 is about 5000 years
so the 1/12 life is reasonably well less than a million years

Answer 22

how u get 5000 years?

Answer 23

wikipedia ;)

http://en.wikipedia.org/wiki/Carbon-14#Origin_and_radioactive_decay