B.O.B Combining

My "muddiest point" in this unit so far has been combining functions. So it's no suprise that the 2.6 packet has been difficult for me. I can usually work my way through a simple combining functions problem, but when I have to find several combinations for two functions, I get lost. A perfect example is numbers 27 through 32 on the packet in question. I don't have any trouble with addition, subtraction, multiplication, or division when combining, but it gets trickly when I have to plug one function into another. I'm not sure if any of that made sence, but that's what I'm struggling with. I'm certainly much better now than at the introduction of this concept, but it's still what I'm the worst at.