1. Chapter 2 Operation Sense Lesson 2.1 Algebra Expressions

2. Vocabulary Variable A letter or symbol that can stand for one or more numbers. Numerical Expression A mathematical phrase that includes Only numbers and operation symbols. Algebraic Expression An expression that includes a variable. It contains a number, letter and a sign. Evaluate To find the value. 5 + nK - 3 60 + 25 100 x 34

3. Translating expressions Write a numerical or algebraic expression for the word expression. 7 more than t 7 + t 2 times a distance d 2 d 3 dollars less than 5 5 - 3 5 times 245 x 24

4. You Try Thirteen $5 bills Twenty five less than seventy Seven more than t Y divided by thirty - four 13 x 5 70 - 25 7 + t or t + 7 Y / 34

5. Evaluate the algebraic expression To evaluate an algebraic expression, replace the variable ( letter) with the value given. Then solve the expression. T + 17, for t = 21 21 + 17 = 38 36, for y = 9 y 36 = 4 9 P – 5, for p = 20 20 – 5 = 15 7b, for b = 4 7 x 4 = 28

6. Your Turn 63b for b = 15 63 x 15 = 945 178 + w, for w = 226 178 + 226 = 404 A B, for a = 253 and b = 11 253 11 = 23 K – 65, for k = 95 95 – 65 = 30

7. Good luck on your assignment!!!!!!! Good luck on your assignment!!!!!!!