Painful bone metastases are common in advanced prostate cancer. Physicians often order treatment with strontium-89 89 Sr , a radionuclide with a strong affinity for bone tissue. A patient is given a sample containing 4 mCi of 89 Sr . a. If 20 % of the 89 Sr remains in the body after 90 days, write a function of the form Q t = Q 0 e − k t to model the amount Q t of radioactivity in the body t days after the initial dose. b. What is the biological half-life of 89 Sr under this treatment? Round to the nearest tenth of a day.
Painful bone metastases are common in advanced prostate cancer. Physicians often order treatment with strontium-89 89 Sr , a radionuclide with a strong affinity for bone tissue. A patient is given a sample containing 4 mCi of 89 Sr . a. If 20 % of the 89 Sr remains in the body after 90 days, write a function of the form Q t = Q 0 e − k t to model the amount Q t of radioactivity in the body t days after the initial dose. b. What is the biological half-life of 89 Sr under this treatment? Round to the nearest tenth of a day.
Solution Summary: The author explains how to determine the model of the amount Q(t) in the form of function.
Painful bone metastases are common in advanced prostate cancer. Physicians often order treatment with strontium-89
89
Sr
, a radionuclide with a strong affinity for bone tissue. A patient is given a sample containing 4 mCi of
89
Sr
.
a. If
20
%
of the
89
Sr
remains in the body after 90 days, write a function of the form
Q
t
=
Q
0
e
−
k
t
to model the amount
Q
t
of radioactivity in the body t days after the initial dose.
b. What is the biological half-life of
89
Sr
under this treatment? Round to the nearest tenth of a day.
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).
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