in exploration 3.1.1 you discovered an example of the number e appearing in mathematics. select the correct example discovered in this exploration. When the area under the curve of 1 y=- is equal to 1 from 1, e). 2 ° tim (1-1) = 200 The X-value for y= is x = e. 1 when y=1 2 The half-life of Carbon-14 is e for material that originated in 1720, when Leonard Euler discovered the special number, e.