Use a calculator, or sum the series to find:
#e^3.8 ~~ 44.70118449330082303755#
If your calculator has an
#e^3.8 ~~ 44.70118449330082303755#
Otherwise, you might like to try the standard series:
#e^x = sum_(n=0)^oo x^n/(n!)#
It takes a few terms to converge.
Here I evaluated it in a spreadsheet:
Column A contains the value of
Column B calculates
Column C calculates
Column D calculates
Column E sums the values from column D