I need help with number 12 7.woodge ofhas athatheresent8. Population Decline The population of a midwestern cityfollows the exponential law.(a) If N is the population of the city and is the time in years.N as a function of t.express(b) If the population decreased from 900,000 to 800,000from 2005 to 2007, what was the population in2009?9. Radioactive Decay The half-life of radium is 1690 years.If 10 grams is present now, how much will be present in50 years?10. Radioactive Decay The half-life of radioactive potassium is1.3 billion years. If 10 grams is present now, how much will bepresent in 100 years? In 1000 years?will11. Estimating the Age of a Tree A piece of charcoal is foundto contain 30% of the carbon-14 that it originally had. Whendid the tree from which the charcoal came die? Use 5730years as the half-life of carbon-14.12. Estimating the Age of a Fossil A fossilized leaf contains 70%of its normal amount of carbon-14. How old is the fossil? Use5730 years as the half-life of carbon-14.13. Cooling Time of a Pizza A pizza baked at 450°F is removedfrom the oven at 5:00 PM and placed in a room that is aconstant 70°F. After 5 minutes, the pizza is at 300°F.(a) At what time can you begin eating the pizza if you wantits temperature to be 135°F?(b) Determine the time that needs to elapse before thepizza is 160°F.(c) What do you notice about the temperature as timepasses?the stein hasstein be afterto reach a tProblem 15.17. Decompositconditions,in a swimmuninhibitedwater andper millionwater agai2.2 ppm. Whours)? Wshock theshock the18. Decomp-pentoxidand oxyAn initidecompdinitroslong wiremain19. Decomsoluticglucosthe laof sumuchtake20. Decewateto th25 1how1k221. RaracpcAitreh

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Answered: 12. Estimating the Age of a Fossil A…

12. Estimating the Age of a Fossil A fossilized leaf contains 70% of its normal amount of carbon-14. How old is the fossil? Use 5730 years as the half-life of carbon-14.

Calculus For The Life Sciences

2nd Edition

ISBN:9780321964038

Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Chapter2: Exponential, Logarithmic, And Trigonometric Functions

Section2.1: Exponential Functions

Problem 37E

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Question

I need help with number 12

7.
wood
ge of
has a
that
here
sent
8. Population Decline The population of a midwestern city
follows the exponential law.
(a) If N is the population of the city and is the time in years.
N as a function of t.
express
(b) If the population decreased from 900,000 to 800,000
from 2005 to 2007, what was the population in
2009?
9. Radioactive Decay The half-life of radium is 1690 years.
If 10 grams is present now, how much will be present in
50 years?
10. Radioactive Decay The half-life of radioactive potassium is
1.3 billion years. If 10 grams is present now, how much will be
present in 100 years? In 1000 years?
will
11. Estimating the Age of a Tree A piece of charcoal is found
to contain 30% of the carbon-14 that it originally had. When
did the tree from which the charcoal came die? Use 5730
years as the half-life of carbon-14.
12. Estimating the Age of a Fossil A fossilized leaf contains 70%
of its normal amount of carbon-14. How old is the fossil? Use
5730 years as the half-life of carbon-14.
13. Cooling Time of a Pizza A pizza baked at 450°F is removed
from the oven at 5:00 PM and placed in a room that is a
constant 70°F. After 5 minutes, the pizza is at 300°F.
(a) At what time can you begin eating the pizza if you want
its temperature to be 135°F?
(b) Determine the time that needs to elapse before the
pizza is 160°F.
(c) What do you notice about the temperature as time
passes?
the stein has
stein be after
to reach a t
Problem 15.
17. Decomposit
conditions,
in a swimm
uninhibited
water and
per million
water agai
2.2 ppm. W
hours)? W
shock the
shock the
18. Decomp-
pentoxid
and oxy
An initi
decomp
dinitros
long wi
remain
19. Decom
solutic
glucos
the la
of su
much
take
20. Dece
wate
to th
25 1
how
1
k
2
21. Ra
rac
pc
A
it
re
h

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