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From Wikipedia
A solver is a generic term indicating a piece of mathematical software, possibly in the form of a standalone computer program or as a software library, that 'solves' a mathematical problem. A solver takes problem descriptions in some sort of generic form and calculate their solution. In a solver, the emphasis is on creating a program or library that can easily be applied to other problems of similar type.
Types of problems with existing dedicated solvers include:
 Linear and nonlinear equations, or systems of such equations. In this case the "solver" is more appropriately called a rootfinding algorithm.
 Linear and nonlinear optimisation problems
 Systems of ordinary differential equations
 Systems of differential algebraic equations
 Logic/satisfiability problems
 Constraint satisfaction problems
 Shortest path problems
 Minimum spanning tree problems
 Search algorithms
The General Problem Solver (GPS) is a particular computer program created in 1957 by Herbert Simon, J.C. Shaw, and Allen Newell intended to work as a universal problem solver, that theoretically can be used to solve every possible problem that can be formalized in a symbolic system, given the right input configuration. It was the first computer program which separated its knowledge of problems (in the form of domain rules) from its strategy of how to solve problems (as a general search engine).
Solvers typically use an architecture similar to the GPS to decouple a problem's definition from the strategy used to solve it. While the strategy utilized by GPS was a general algorithm with the only goal of completeness, modern solvers tend to use a more specialized approach tailored to the specific problem class which the solver aims for. The advantage in this decoupling is that the solver doesn't depend on the details of any particular problem instance.
For problems of a particular class (e.g., systems of nonlinear equations) there are usually a wide range of different algorithms available; sometimes a solver implements multiple algorithms, but sometimes just one. Normally, solvers just use numerical methods, although there are some solvers that are capable of performing some symbolic manipulation to find a solution.
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Answers:A lot of text books have web sites that you can go to for extra help. Read the intro to your book carefully to see if your book has such a resource.
Answers:You need a onetoone teacher to whom you can explain your confusions, difficulties and worries. When you hear the explanations it will be to YOUR problems.. I always finish a lesson by having my pupil tell me how to do the problems we have studied. This is when you find out errors in comprehension. You cannot do this in a class. Keep trying. Your concern will lead you to a solution. I wish we were nearer.
Answers:I doubt that there's a good one out there for free. The good ones will need to be bought. You can post a question or two here along with your answer and we can tell you if you are correct or not.
Answers:Look around for a scientific calculator; you can perform operations with fractions and it will give you answers in fractions or mixed numbers. I'm sure someone will have one, or ask for one at your school library or from your math teacher!
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