Solve the problem.In the formula A = Iekt, A is the amount of radioactive material remaining from an initial amount I at a given time t and k is a negative constant determined by the nature of the material. A certain radioactive isotope has a half-life of approximately 1400 years. How many years would be required for a given amount of this isotope to decay to 45% of that amount?
A. 1568 years
B. 1613 years
C. 770 years
D. 1207 years
Answer: B
Mathematics
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Provide an appropriate response.Solve: x2 - 3x - 2 = 0
Fill in the blank(s) with the appropriate word(s).
Mathematics
Add or subtract terms whenever possible.
+ 
+ 
+ 
A. 181
+ 15
B. 19
+ 
+ 
C. 
+ 
+ 15
D. 19
+ 15
Mathematics
Solve the equation by completing the square.x2 + 5x - 5 = 0
A. 
B. 
C. 
D. {-5 - 3
, -5 + 3
}
Mathematics
Use the table to solve the problem.For a function f we have the following numerical representation.
Evaluate f for x = 2.
A. -0.17 B. -0.33 C. 0.33 D. 2
Mathematics