E in exponential regression equation

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Hello I came across an exponential regression equation in excel and I was wondering what did the "E" stand for? the equation is : y=5E-09e^0,0139x 1 Can someone please help me by showing what the E stands for and the answer for my equation. Thanks.

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This is a common way that some programs express numbers in scientific notation. 5E-09 means $5 \times 10^{-9} = 0.000000005$.