I'm a bit confused, a state my wife says is normal for me. You say you can do problems 6, 8, 9, and 10, but those are the ones that involve "solving" an algebra problem. Most of the rest involve understanding the concepts and vocabulary of basic price theory, sometimes called partial equilibrium analysis. Almost all economics today is summarized in the language of mathematics, and partial equilibrium analysis is easily understood in terms of a simple graph.
The idea is this. Quantity demanded of X is considered the dependent variable of a function where the independent variable is a unit price of X. That demand function has a non-positive slope. Quantity supplied of X is considered the dependent variable of a function where again the independent variable is the unit price. That supply function has a non-negative slope. There is equilibrium when the price is such that quantity supplied and quantity demanded are equal. Graphically it is the intersection of two curves. What happens to the intersection point if one curve is shifted and the other stays the same. It involves comparing different equilibria.
We can help. Tell us the first problem that gives you trouble and what work you have done on that problem or what ideas you have so we can see where you are stuck