Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter7: Analytic Trigonometry
Section7.6: The Inverse Trigonometric Functions
Problem 94E
Related questions
Question
No need solution just indicate the right answer.
![25. (x+2y)dx + (2x + y) = 0
A. Exact
B. Not Exact
26. (2xy²-3x²)dx + (x² + 2y)dy = 0
A. Exact
B. Not Exact
27. (6x + y2)dx + y(2x-3y)dy = 0
A. Exact
B. Not Exact
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%2F8c391026-1ab3-4150-9cdb-196abf4b13fe%2F6cf8ecb2-28eb-44e6-ac6a-6526ed878604%2F4eblm2h_processed.jpeg&w=3840&q=75)
Transcribed Image Text:25. (x+2y)dx + (2x + y) = 0
A. Exact
B. Not Exact
26. (2xy²-3x²)dx + (x² + 2y)dy = 0
A. Exact
B. Not Exact
27. (6x + y2)dx + y(2x-3y)dy = 0
A. Exact
B. Not Exact
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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