1. ACT Opener The formula for calculating sales tax is S=Ar, where S is the sales tax, A is the cost of the product, and r is the local sales-tax rate. If the cost of a t.v. was $400 and the sales tax was $24, what was the local sales-tax rate. P.S – Use your phone as a calculator

2. Quick Review: You will have twenty minutes to complete the complex number review: You must work each problem by hand.

3. Absolute value of Complex Numbers: The absolute value of a real number is its distance from 0 on the number line. A complex number’s absolute value is also a measure of its distance from zero, However, instead of measuring this distance on the number line, a complex number’s absolute value is measured from zero on the complex number plane.

4. Example

5. Solve the following:

6. Quick Quiz:

7. The Fundamental Theorem of Algebra If f(x) is a polynomial of degree n, where n > 0, then f has at least one zero in the complex number system.

8. Linear Factor Theorem:

9. Finding the zeros of a polynomial