Evaluate and Simplify Expressions SWBAT apply the order of operations to evaluate algebraic expression when values are given; combine like terms in algebraic expressions

Review Some students are visiting a science museum. They pay $7 per student and a group fee of $25. Write and algebraic expression for the total cost of the trip. – $7s + 25 If there are 124 students going on the trip, what is the total cost they will pay for the trip? –$7(124) + $25 –$868 + $25 –$893

Evaluate  56 – p(q+r), when p = 3, q = 4.2, and r = 5.1  (x+1) 2 + y ÷ z, when x = 3, y = 8.8, and z = 4  15 + cj 3, when c = 6, and j = 5  (d + e ÷ 9)2 – 14f, when d = 8, e = 45, and f = 2

Definitions  Terms –Parts of an algebraic expression that are separated by an addition or subtraction sign  Like terms –Terms that have exactly the same variable

Combining like terms  20n – 6n – 3 –14n - 3  y – 2y – y  9z 2 – 5z + 3z 2 –12z 2 – 5z

Simplify and Evaluate  20n – 6n – 3, when n = 2.5  14n -3  14(2.5) – 3  20(2.5) – 6(2.5) – 3  32  y – 2y, when y = 3.1  y  (3.1)   9z 2 – 5z + 3z 2, when z = 10  12z 2 – 5z  12(10) 2 – 5(10)  1150

Answers   92  271.6