1. Yes, but you'll have to be more specific. If for instance you want the entire Column B to be in red text if the value in B1 is less than 10, then would do this: Highlight the column. Click on Format -> Conditional Formatting. Under the condition, select Formula Is. In the field to the right type =$B$1<10. Click on the format button and change the color to red.
2. I'm no statistician, but it sounds like you would use the Trend function. From what little I know Growth function is for exponential type of growth.
See also:
See also: 1107.html
I concur with Dan (see his reply).
You need enough data points. If the growth is exponential, you can use GROWTH. If linear, use TREND.
I'd also suggest as a possible approach transforming your data points by taking their logarithms or square roots then applying TREND to the transformed set.
Aladin