Solve the problem.A certain radioactive isotope has a half-life of approximately 1250 years. How many years to the nearest year would be required for a given amount of this isotope to decay to 70% of that amount?
A. 2171 yr
B. 375 yr
C. 643 yr
D. 573 yr
Answer: C
Mathematics
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Integrate the function.
dy
A. 
+ C
B. 
- sin-1
+ C
C. 
- sin-1
+ C
D. 
- sin-1y + C
Mathematics
Using a calculator, evaluate to four decimal places.log 70
A. 4.7485 B. 1.3451 C. 4.2485 D. 1.8451
Mathematics
Solve the problem.Why does logaa always equal 1 for any valid base a?
Fill in the blank(s) with the appropriate word(s).
Mathematics
Find all solutions to the equation. Express the solution in degrees.cos x = -1
A. 360°n or 180° + 360°n B. 180° + 360°n C. 360°n D. 90° + 360°n or 270° + 360°n
Mathematics