Organic Chemistry structure

I need some help with drawing 2 different structures.

1. 2,6-dimethyl-4-(2-methylpropyl)decane
-im having the most trouble with the (2-methylpropyl) group

2.sec-butylcycloheptane
-Just not getting this im putting the cycloheptene with the 3 CH3 bonds coming out of it what else am i missing?

thanks guys!