Warm UpThe following formula can be used to calculate a baseball player’s on-base percentage .

During the first twenty games of the season, Ian has 10 hits, 2 walks, 35 at bats, 5 sacrifice flies, and he has been hit by 1 pitch.

1. What does the variable h represent?

2. What is Ian’s on-base percentage?

3. How would Ian’s on-base percentage change if he had not been hit by any pitches?

h is the number of hitsw is the number of walks p is the number of times the player has been hit by a pitchb is the number of times at bats is the number of sacrifice flies and bunts

Warm UpThe following formula can be used to calculate a baseball player’s on-base percentage .

During the first twenty games of the season, Ian has 9 hits, 2 walks, 38 at bats, 5 sacrifice flies, and he has been hit by 1 pitch.

1. What does the variable b represent?

2. What is Ian’s on-base percentage?

3. How would Ian’s on-base percentage change if he had not been hit by any pitches?

h is the number of hitsw is the number of walks p is the number of times the player has been hit by a pitchb is the number of times at bats is the number of sacrifice flies and bunts

1.1 Expressions and FormulasVariables are letters used to represent unknown quantities.

Algebraic expressions contain at least one variable.

To solve apply the Order of Operations.

Examples

1.

2.

Key ConceptA formula is an expression of the relationship between certain quantities.

Examples

Use the formula

1. Room temperature commonly ranges from F to F. Determine the room temperature range in degrees Celsius.

2. The normal average human body temperature is F. A temperature above this indicates a fever. If your temperature is C, do you have a fever?

GROUP WORK

Materials:1. One Sheet of loose-leaf paper per person2. Pencil!!!3. Textbook

Turn to page 7.Solve problems 3, 5, and 7

together.

Group Work Answers

1.2 Properties of Real Numbers

Real numbers consist of several different kinds of numbers.

• Rational – The decimal form is always repeating or terminating.

• Irrational – the decimal form neither terminates nor repeats.

• Integers

• Whole

• Natural

ExamplesName ALL the sets of numbers to which each example belongs.

Key Concept

Warm Up

1. What is the value of ?

2. Evaluate if a = 2, b = 4, and c = -1.

3. Name the set of numbers to which belongs.

4. Name the set of numbers to which the value of belongs.

Key Concept

The additive inverse of a number:

The multiplicative inverse of a number:

ExamplesFind the additive and multiplicative inverse for each number.

Key ConceptThe properties of real numbers can be used to simplify algebraic expressions.

Simplify

ExamplesSimplify.

GROUP WORK

Turn to page 14.Solve problems 1, 3, 9, and 17.

Group Work Answers

Naturals, Whole, Integers, Rational, Real

Irrational, Real

Homework Problems

Lesson 1.1Pgs. 7-8 #’s 11-15 ODD, 19-23 ODD, and #43

Lesson 1.2Pgs. 14-15#’s 19-25 ODD, 31-35 ODD, 37-39 ODD, and #53