# Week 19 – Top 5 Things I learned in precalculus 11

This year in Precalculus 11 I learned so many things and different things in each unit. Some of the units were a little bit hard and some of the units were easy.  Here are the top things I’ve learned in precalculus 11.

1. The first thing in the top five is multiplying and dividing rational expression. It’s used for simplifying products and quotients of rational expression. Here is an example:

2. The second thing in the top five is the arithmetic series. It’s used to determine the sum of n term of an arithmetic series, then solve related problems. Here is an example:

3. The third thing in the top five is using special triangles. It’s used to explore the condition for which given information is sufficient to construct a unique triangle. For example:

4. The fourth thing in the top five is solving systems of equations algebraically. Use algebraic strategies to solve linear quadratic system and quadratic-quadratic system. For example:

5. The fifth thing in the top five is multiplying and dividing radical expressions. It’s used to simplify products and quotients of radical expression. Here is an example: