Let Q represent a mass of radioactive plutonium 
(in grams), whose half life is 24,100 years. The quantity of plutonium present after t years is 
Determine the quantity present after 67,000 years. Round your answer to one decimal place.
a. 4.3 g
b. 3.3 g
c. 5.3 g
d. 2.3 g
d. 2.3 g
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Find the center of mass of a thin plate covering the given region with the given density function.The region bounded by the curves y = ± 
and the lines x = 1 and x = 9, with density ?(x) = 
A. 
= 4, 
= 0
B. 
= 5, 
= 0
C. 
= 3, 
= 0
D. 
= 2, 
= 0
Determine if the statement is a proportion.I. 
II. 
A. I is a proportion, II is not a proportion. B. I is not a proportion, II is a proportion. C. I and II are both proportions. D. Neither I nor II are proportions.
Provide an appropriate response.The type of bond that gives the issuing corporation the right to purchase the bond back prior to its maturity is:
A. participating B. registered C. convertible D. recallable
In order to be certified, an EMT trainee (EMT stands for "emergency medical technician") must pass a written examination. A study of 76 trainees is conducted to assess the effectiveness of exam-preparation seminars in reducing the failure rate. The data are summarized below. 0 seminars attended 1 seminar attended 2 seminars attended Total Passed exam 5 14 19 38 Failed exam 8 15 15 38 Total 13 29 34 76 Find the probability that the trainee attended one seminar and passed the exam.
A. 
B. 
C. 
D. 
E. 