Do Now ( 1.) 12 ÷ 4 + (5 2 – 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 ,945 people

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12/9/ B Algebra: Variables & Expressions

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)

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

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

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

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

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

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

Yes, 84 lbs is < 100 lbs

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