this week I learned about trigonometry, it’s including the angles and the side. The reference angle for all 4 angles is the acute angle that the terminal arm makes with the x-axis.

last week I learned about solving absolute value equations, we were solving by graphing. Graphically for algebraically linear and quadratic. We need make a graphing to solve the equation.

this week I learned about quadratic inequalities, this is brand new for me. It has greater- than and less-than in inequality. And how to graphing quadratic inequalities, ugly line and perfect line. And add (0,0) to find out which side is it.

I didn’t learn anything this week，but I reviewed what I learned before. Such as Sequences and series, Absolute Value and Radicals and Quadratic equations, etc.

this week I learned about how to solving problems with Quadratic functions, some problems can be solved by writing, Then graphing a quadratic function. And determining maximum or minimum related to operations with numbers. And modeling a problem for maximizing profits.