Chapter 1.04

#3
#4

#7
#8
#9
#10
#11
#12

#15
#16
#17
#18

#21
#22
#23

#25
#26

#28
#29
#30

#32
#33
#34

#36

#38

QA: optional but cool: based on #36: type into Wolfram Alpha: 
i) play sin(4400*2*pi*sqrt(t)) for 2 seconds
ii) play sin(44*2*pi*t^2) for 10 seconds