We've moved to 3740 N. Josey Lane, Suite 102, Carrollton, TX 75007, Tel: 972-325-7232, Fax: 972-215-7333

help needed

I included video link i'm trying to follow

Dont understand multiples of 15 plus 4
if i want to widen pattern how do i work out

http://www.youtube.com/watch?v=JqDJfJiDRuo&NR=1&feature=fvwp

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