Excel for mac trendline formula not in scientific notation

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I'll post the scatterploy and calculated data below, let me know if any further information is needed. I don't know what I'm missing here, please help if you can. The problem I'm getting is that when I try to graph my calculated cells, I get a totally different graph from my original trendline. I then put this formula into cells in order to plot where I fall on the trenline for a given timeframe in my attrition model (e.g.

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I have made a scatterplot of employee attrition, and I've also created (using excel) a 4th degree polynomial trendline that best matches the data.