Is amount off an increase or decrease

Use set buikder notation to represent the following set: {, -2, -1, 0}

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

Answer each of the questions for the following diagram: 1. what type of angles are these? 2. solve for x. what does x equal? 3. what is the measure of the angles?