I have tried to make a program for school using some basic combo boxes, text boxes, and a few command buttons. I am over my head, but anyone that knows VB would know this stuff like the back of their hand.

I have made a webpage (because I'm better at that) to help everyone understand where I'm at now.

You can find that page @ http://artsapimp.8m.com

I need the equation to be ET=kpt/100

k is the first box at the top.
p is a value determined by deciding the month and Latitude from the drop down boxes.
t is the temperature (3rd box).

when you click calculate it should show the value of ET in the last text box.

Please reply with any questions if you have any.

Thanks for your help