Download presentation

Presentation is loading. Please wait.

Published byDomenic Gully Modified over 2 years ago

1
Writing & Evaluating Variable Expressions Chapter 1-3 Pre-Algebra Prentice Hall

2
Evaluation Variable Expressions To evaluate a variable expression, you first replace each variable with a number. Than, you use the order of operations to simplify the expression. Evaluate: 4y − 15 for y = 9 ◦ First replace the variable y with number 9 ◦ 4∙9 − 15 ◦ Than use order of operation to simplify: ◦ 36 − 15 = 21

3
Quick Check Evaluate each expression. 1. 6(g + h), for g = 8 and h =7 ◦ 90 2. 2xy – z, for x = 4, y = 3, z = 1 ◦ 23 3. for r = 13, and s = 11 ◦ 12

4
Purchasing Problem Example Energy drinks come in cases of 24 bottles. a)Write a variable expression for the number of cases a store should order to get b bottles of energy drinks. b)Evaluate the expression for 120 bottles. ← bottles wanted ← number in case Evaluate for b = 120 cases

5
Exercises 1. ◦ 15 2. ◦ 11 3. ◦ 91 4. ◦ 99 5. ◦2◦2

6
Problems 1. Write an expression for the number of kilometers a dolphin travels in d hours swimming at 8km/h. Then find the number of kilometers the dolphin travels in 3 hours ◦ 8d 24 km 2. A fitness club requires a $100 initiation fee and dues of $25 each month. Write an expression for the cost of membership for n months. Then find the cost of membership for one year. ◦ 100 + 25n $400

Similar presentations

OK

Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall. 5.4 Adding and Subtracting Rational Expressions with Different Denominators.

Copyright © 2011 Pearson Education, Inc. Publishing as Prentice Hall. 5.4 Adding and Subtracting Rational Expressions with Different Denominators.

© 2017 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on parallel lines Viewer ppt online form Ppt on indian airline industry Ppt on bio battery download Ppt on power generation transmission and distribution Ppt on indian retail industry Ppt on word association testing Ppt on p&g products samples Ppt on wireless sensor networks applications Pharynx anatomy and physiology ppt on cells