For those using think python, here are some notes to help. In 2.2 I think the question regarding literal numeric values starting with zero is a trick question unless you have a C programming background. Don’t loose any sleep over this point. in 2.10 that 1’'/2p should be 1 over 2 pi in 2.12 exercise 4-1 again p is pi In 4-2 and 4-3 don’t worry if you have trouble with the algebra just do what you can.