Technetium-99 99 m Tc is a radionuclide used widely in nuclear medicine. 99 m Tc is combined with another substance that is readily absorbed by a targeted body organ. Then. special cameras sensitive to the gamma rays emitted by the technetium are used to record pictures of the organ. Suppose that a technician prepares a sample of 99 m Tc -pyrophosphate to image the heart of a patient suspected of having had a mild heart attack. a. At noon, the patient is given 10 mCi (millicuries) of 99 m Tc . If the half-life of 99 m Tc is 6 hr, write a function of the form Q t = Q 0 e − k t to model the radioactivity level Q t after t hours. b. At what time will the level of radioactivity reach 3 mCi? Round to the nearest tenth of an hour.
Technetium-99 99 m Tc is a radionuclide used widely in nuclear medicine. 99 m Tc is combined with another substance that is readily absorbed by a targeted body organ. Then. special cameras sensitive to the gamma rays emitted by the technetium are used to record pictures of the organ. Suppose that a technician prepares a sample of 99 m Tc -pyrophosphate to image the heart of a patient suspected of having had a mild heart attack. a. At noon, the patient is given 10 mCi (millicuries) of 99 m Tc . If the half-life of 99 m Tc is 6 hr, write a function of the form Q t = Q 0 e − k t to model the radioactivity level Q t after t hours. b. At what time will the level of radioactivity reach 3 mCi? Round to the nearest tenth of an hour.
Solution Summary: The author explains the model for the radioactivity level Q(t) of a radionuclide, 99
Technetium-99
99
m
Tc
is a radionuclide used widely in nuclear medicine.
99
m
Tc
is combined with another substance that is readily absorbed by a targeted body organ. Then. special cameras sensitive to the gamma rays emitted by the technetium are used to record pictures of the organ. Suppose that a technician prepares a sample of
99
m
Tc
-pyrophosphate to image the heart of a patient suspected of having had a mild heart attack.
a. At noon, the patient is given 10 mCi (millicuries) of
99
m
Tc
. If the half-life of
99
m
Tc
is 6 hr, write a function of the form
Q
t
=
Q
0
e
−
k
t
to model the radioactivity level
Q
t
after t hours.
b. At what time will the level of radioactivity reach 3 mCi? Round to the nearest tenth of an hour.
Consider the function f(x) = x²-1.
(a) Find the instantaneous rate of change of f(x) at x=1 using the definition of the derivative.
Show all your steps clearly.
(b) Sketch the graph of f(x) around x = 1. Draw the secant line passing through the points on the
graph where x 1 and x->
1+h (for a small positive value of h, illustrate conceptually). Then,
draw the tangent line to the graph at x=1. Explain how the slope of the tangent line relates to the
value you found in part (a).
(c) In a few sentences, explain what the instantaneous rate of change of f(x) at x = 1 represents in
the context of the graph of f(x). How does the rate of change of this function vary at different
points?
1. The graph of ƒ is given. Use the graph to evaluate each of the following values. If a value does not exist,
state that fact.
и
(a) f'(-5)
(b) f'(-3)
(c) f'(0)
(d) f'(5)
2. Find an equation of the tangent line to the graph of y = g(x) at x = 5 if g(5) = −3 and g'(5)
=
4.
-
3. If an equation of the tangent line to the graph of y = f(x) at the point where x 2 is y = 4x — 5, find ƒ(2)
and f'(2).
Elementary Statistics: Picturing the World (7th Edition)
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