1. 1.2 Order of Operations and Evaluating Expressions: Power: Has two parts, the base and exponent ( b 2  b = base, 2 = exponent ) Exponent: The number that tells you how many times we multiply the base.

2. Evaluate: Replace the variables with given numbers to simplify an expression. Simplify: Perform math operations to get a shorter expression and/or an answer. Base: The number that is multiplied according to the exponent

3. GOAL:

4. REAL-WORLD: An object’s momentum is defined as the product of its mass m and velocity v. Write and expression for the momentum of the object. Make a table to find the momentum of a vehicle with a mass of 1000 kg moving at a velocity of 15 m/s, 20 m/s and 25 m/s.

5. SOLUTION: Expression: Momentum = (mass)(velocity) mass = m velocity = v Momentum = (m)(v)

6. SOLUTION: Table: Momentum = (m)(v) MassVelocityMomentum= mv 100015 m/s15,000 100020 m/s20,000 100025 m/s25,000 1000W m/s1000w

7. YOU TRY IT: Evaluate the expression for s = 4 and t = 8 ( s + t ) 3

8. SOLUTION: When we evaluate we replace the given value for the variables. S = 4 and t = 8 (s + t ) 3 Therefore: 1728 is the answer. (4 + 8 ) 3 (12) 3 (12)(12)(12) Replace PEMDAS Multiplication

9. VIDEOS: Variables and Expressions Variables: http://www.khanacademy.org/math/algebra/intro duction-to-algebra/variable-and- expressions/v/what-is-a-variable http://www.khanacademy.org/math/algebra/intro duction-to-algebra/variable-and- expressions/v/variables-and-expressions-1 Expressions:

10. CLASSWORK: Page 13-15: Problems: As many as it takes for you to master the concept