A patient is treated with 128 mCi (millicuries) of iodine- 131 131 I . The radioactivity level R t (in mCi) after t days is given by R t = 128 2 − t / 4.2 . (In this model, the value 4.2 is related to the biological half-life of radioactive iodine in the body.) a. Determine the radioactivity level of 131 I in the body after 6 days. Round to the nearest whole unit. b. Evaluate R 4.2 and interpret its meaning in the context of this problem. c. After how many half-lives will the radioactivity level be 16 mCi?
A patient is treated with 128 mCi (millicuries) of iodine- 131 131 I . The radioactivity level R t (in mCi) after t days is given by R t = 128 2 − t / 4.2 . (In this model, the value 4.2 is related to the biological half-life of radioactive iodine in the body.) a. Determine the radioactivity level of 131 I in the body after 6 days. Round to the nearest whole unit. b. Evaluate R 4.2 and interpret its meaning in the context of this problem. c. After how many half-lives will the radioactivity level be 16 mCi?
A patient is treated with 128 mCi (millicuries) of
iodine-
131
131
I
.
The radioactivity level
R
t
(in mCi) after
t
days is given by
R
t
=
128
2
−
t
/
4.2
.
(In this model, the value 4.2 is related to the biological half-life of radioactive iodine in the body.)
a. Determine the radioactivity level of
131
I
in the body after 6 days. Round to the nearest whole unit.
b. Evaluate
R
4.2
and interpret its meaning in the context of this problem.
c. After how many half-lives will the radioactivity level be 16 mCi?
4
In the integral dxf1dy (7)², make the change of variables x = ½(r− s), y = ½(r + s), and
evaluate the integral. Hint: Find the limits on r and s by sketching the area of integration in the (x, y) plane along
with the r and s axes, and then show that the same area can be covered by s from 0 to r and r from 0 to 1.
7. What are all values of 0, for 0≤0<2л, where 2 sin² 0=-sin?
-
5π
6
π
(A) 0, л,
and
6
7π
(B) 0,л,
11π
, and
6
6
π 3π π
(C)
5π
2 2 3
, and
π 3π 2π
(D)
2' 2'3
, and
3
4元
3
1
די
}
I
-2m
3
1
-3
บ
1
#
1
I
3#
3m
8. The graph of g is shown above. Which of the following is an expression for g(x)?
(A) 1+ tan(x)
(B) 1-tan (x)
(C) 1-tan (2x)
(D) 1-tan
+
X
-
9. The function j is given by j(x)=2(sin x)(cos x)-cos x. Solve j(x) = 0 for values of x in the interval
Quiz A: Topic 3.10
Trigonometric Equations and Inequalities
Created by Bryan Passwater
can you solve this question using the right triangle method and explain the steps used along the way
Elementary Statistics: Picturing the World (7th Edition)
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