1. Do Now (www.bbc.co.uk) 1.) 12 ÷ 4 + (5 2 – 6) 2.) 26 + 6 2 ÷ 4 3.) On December 3 rd the world’s largest Christmas tree formed by people was created in Honduras. Solve this problem to figure out how many people gathered together to set this record. 22 35 2,945 people

2. (www.bbc.co.uk)

3. 12/9/14 5-1 B Algebra: Variables & Expressions

4. algebra- a language of symbols including variables variable- a symbol, usually a letter, used to represent a number or something unknown coefficient- a number before a variable (attached by multiplication)

5. algebraic expressions- contain at least one variable and at least one operation evaluate- find the value of – Synonyms…… Solve, simplify, find

6. Example 1 Evaluate 20 + c if c = 5. 20 + c 20 + 5 Replace c with 5. 25 Add 20 and 5.

7. Example 2 Evaluate p – q if p = 14 and q = 13. p – q Replace p with 14 and q with 13. 14 – 13 Subtract 13 from 14. 1

8. Example 3 Evaluate 2x + 3 if x = 4. 2x + 3 2 4 + 3 8 + 3 11

9. Ex. 4 Evaluate 4y 2 ÷ (4 + 2) if y = 3 4 (3 2 ) ÷ (4 + 2) 4(9) ÷ (6) 36 ÷ 6 6

10. Example 5 The amount of money Sabrina will need to pay for 5 binders using a $2 coupon can be represented by the expression 5x – 2, where x is the cost of each binder. Find the amount of her purchase if each binder is $4. 5x – 2 5(4) – 2 20 – 2 $18

11. 26 1 3 129 Yes, 84 lbs is < 100 lbs

12. Homework Pg. 276 #1-34 Evens Study for Quiz. Ch. 4 Quiz Corrections are due tomorrow.