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To answer the questions shown in the figure atttached, it is important to remember that the irrational number e is also called "Euler's number" and you can find it in many exercises in mathematics.
 2. Then, the irrational number e is:
 e=2.71828
 3. When you calculate the expression e^-2 in your calculator, you obtain:

 e^-2=0.135335

 4. Therefore, the correct answer for the question shown above is the first option, which is:

 a. 0.135