Exponential Functions in AE Expressions

Hello. I am completely new to AE and recently began working with Expressions from scratch. I want a 2D object to scale from 10% to 100% over a modifiable length of time. However, I do not want the transformation to be linear and I don't want to create keyframes since this effect will later be triggered by another layer's properties.

begS=10;//initial and minimum scale
dK=.95//decay rate, must be < 1
xScale=begS+90-(90*(dK^time));// initial time + 90- a value that decreases with time from 90, never reaching 0.
yScale=xScale
[xScale,yScale]

I suspect it's a noob's syntax or language issue because the formula looks right in a graphing calculator. Basically, when I use this expression the animation jumps around and begins at 100% scale.

Anything to the 0 power is 1, so the scale value at time=0 should be: 10+90-(90*1)=10%.
At time=1, the scale should be: 10+90-(90*.95)=14.5%... and so on.

Thanks you for any help.




I searched the forums and found no explicit discussion about exponential notation within After Effects Expressions.