28. After 500 years, a sample of radium-226 has decayed to 80% of its original mass. Find the half- life of radium-226. A. 215.34 years B. 300.23 years C. 250 years D. 110.78 years
28. After 500 years, a sample of radium-226 has decayed to 80% of its original mass. Find the half- life of radium-226. A. 215.34 years B. 300.23 years C. 250 years D. 110.78 years
Chapter10: Exponential And Logarithmic Functions
Section10.5: Solve Exponential And Logarithmic Equations
Problem 10.88TI: Researchers recorded that a certain bacteria population declined from 700,000 to 400,000 in 5 hours...
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![28. After 500 years, a sample of radium-226 has decayed to 80% of its original mass. Find the half-
life of radium-226.
A. 215.34 years
B. 300.23 years
C. 250 years
D. 110.78 years
29. A body temperature of 50°F is placed outdoor where the temperature is 100°F. If after 5
minutes the temperature of the body is 60°F find the temperature of the body after 48
minutes?
A. 67.99°F
B. 75.02°F
C. 80.50°F
D. 84.78°F
30. A metal bar at a temperature of 100°F is placed in a room at a constant temperature of 0°F. If
after 20 minutes, the temperature of the bar is 50°F. What is the temperature after 45 minutes?
A. 10.21°F
B. 15.79°F
C. 21.02°F
D. 30.99°F](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ff589d72e-f367-4cd0-8838-1c36e2673f8c%2F7d1a484c-e9ab-4a6a-b011-0335b6dc2aed%2Fzpyuw5_processed.jpeg&w=3840&q=75)
Transcribed Image Text:28. After 500 years, a sample of radium-226 has decayed to 80% of its original mass. Find the half-
life of radium-226.
A. 215.34 years
B. 300.23 years
C. 250 years
D. 110.78 years
29. A body temperature of 50°F is placed outdoor where the temperature is 100°F. If after 5
minutes the temperature of the body is 60°F find the temperature of the body after 48
minutes?
A. 67.99°F
B. 75.02°F
C. 80.50°F
D. 84.78°F
30. A metal bar at a temperature of 100°F is placed in a room at a constant temperature of 0°F. If
after 20 minutes, the temperature of the bar is 50°F. What is the temperature after 45 minutes?
A. 10.21°F
B. 15.79°F
C. 21.02°F
D. 30.99°F
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