1e+0.8= What? What does E mean?

Question

Hello I came across a math equation and I was wondering what did the "e" stand for? the equation is : y=47931x-1E+0.8 Can someone please help me by showing what the E stands for and the answer for my equation. I know that I need to sub in a point for x so the only thing stopping me from answering the question is what to do for the 1E+0.8 part.

Answer 1

If it's a capital E, it should be scientific notation, specifically E notation.

Because 100,000,000 takes up a lot of space and can be difficult to compare with other numbers, it's written as $1$x$10^8$. Some calculators (and some books, to match) write this with an E:

By PRHaney - Own work, CC BY-SA 3.0

But that's done with integers, and you have $0.8$, so it must be

$$y = 47931x - e^{0.8},$$

using the natural exponential function.

Note that you can use lowercase e for scientific notation, but capital E should not be used for the natural exponential function.

Answer 2

E = Exponentiation in base $10$.

Examples:

$$1.23\ \text{E+0.2} = 1.23\cdot 10^{0.2}$$

$$1.23\ \text{E-2.1} = 1.23\cdot 10^{-2.1}$$