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).

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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}

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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