What kind? I have two BIL's who can't draw wiring diagram for a stair light, you know where there is one switch at the bottom of the stairs and one switch on top, and no matter which way you flip the switch the light either turns on or turns off.

I ask because you really don't need to take math class to understand these things do you? After all, acceleration is rate of change and so is the rate at which your garden grows.

__________________
You don't need a weatherman to know which way the wind blows - Robert A. Zimmerman