Do Now (www.bbc.co.uk)The world’s largest floating Christmas tree was finished on December 1st, 2014. It is floating in the Rodrigo de Freitas Lagoon in Brazil. 1.) Simplify to find how many meters high the tree is:

2.) Find: , which is the # of tons the tree weighs. 3.) This is about the weight of small cars.

85 meters

500 tons

1000 cars

Do NowEvaluate each expression if a=4, b=15, and c=91.) b2 – 5c

2.) 4b ÷ 5

3.) 2ac

180

12

72

12/11/2014 5-1D Algebra: Write Expressions

Method

- define the variable- choose a variable - decide what the variable represents

Example 1Write the phrase two dollars less than the price of a movie ticket as an algebraic expression.

The expression is m – 2.

$$$

Example 2Write the phase five years less than her aunt’s age as an algebraic expression.

The expression is a – 5.

Example 3Sheri made a certain number of bracelets for the craft fair. Mika made 5 less than three times the number of bracelets that Sheri made. Write an expression to represent the number of bracelets Mika made.

The expression is 3b – 5.

Example 4

The library has five times the amount of books that a local store has on display.

5b

Ex. 5

One third of the points that the Beach scored

⅓p or p ÷ 3

Ex. 6

A plumber charges $50 to visit a house plus $40 for every hour of work. Define a variable and write an expression to represent the total cost of hiring a plumber.

40h + 50

Exit Ticket

1.) 9s2.) e + 6

3.) n – 7 4.)3n + 4

Homework

• Pg. 284 #1-16 Evens• TenMarks assignment due tomorrow (written

work and electronic portion)