Value of e:
e = 2.71828 18284 59045 23536 (truncated to 20 decimal places)
The formula for working out the value of e = 1/0! + 1/1! + 1/2! + 1/3! + 1/4! + 1/5! + 1/6! + ....
The ! symbol means factorial.
OR,
e^x is the limit of the following series.
1 + x/1! + x^2/2! + x^1/3! . . . +x^n/n!
For x = 1, the limit is e. Hence
e = Limit[ 1 + 1 + 1/2! + 1/3! . . . +1/n! ]
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Triangles ar e 2 demensional shapes so they don't have volume, but you calculate the area by the base ttimes the height divided by 2
658.4
i (taken to be sqrt(-1) for this question) requires that you know a bit about writing complex numbers. i = e^(i*pi/2) so i^i = (e^(i*pi/2))^i which equals e^(i*i*pi/2) since i*i = -1 we get e^(-pi/2) so i^i = e^(-pi/2) which is roughly .207879576
E = mc^2
If she paid 'e' dollars after a 20% discount, it means she paid only 80% of the original cost. To calculate the original, we divide by that. e/0.80 = 1.25e.