EE2: Expressions Objective: I can write and evaluate algebraic expressions for real world contextual situations.

Bell work: Notetaking  Textbook: Page 48  Copy the Order of Operations steps found in the box using Cornell notes in your spiral. Use a new page for these notes.

 Remember: Area = Length x Width.  The area for a square is x 2.  Draw a diagram representing each figure.  Write an exponential expression to solve the area of each square:  A square has a side length of 6 cm.  A square has a side length of 3 cm.  A square has a side length of 10 cm. Concept Review: Square 6 2 cm 2 = 36 cm cm 2 = 9 cm cm 2 = 100 cm 2

Review: Group Discussion Discuss in your group, what the following key vocabulary words mean: Algebraic expression Numerical expression Equation/Expression Coefficient Variable

Group Brainstorming: Graphic Organizer Create a Tree Map and brainstorm words that signal the following Operations: Addition – Subtraction – Multiplication – Division - Exponents

Group Work: Writing Expressions Review  The quotient of 12 and x  The product of x and 6  A number, (h), decreased by 7  15 less than 4 times w  Twelve decreased by the difference of x and 7  5 less than 3t  Five times the sum of h and 8 12 ÷ x 6x h - 7 5(h + 8) 4w – (x – 7) 3t - 5

Writing Expressions Using Words  a – b  xy  4f + u  D – b 3

Real Life Situations  Mrs. Tanaka’s class is planning a trip to Harkins Theater. It will cost $10 for the school bus and the price of a ticket is $13 per student. What will determine the amount of the money her class will have to raise for the trip?  Write an expression to show the amount of money the class needs to raise.  What does the n represent?  How much will it cost if 10 students attend?  How much will it cost if 26 students attend? $10 + $13n N = the number of students who will attend

Real – Life Situations  Ande bought a book and 5 markers. The book cost $6.00, but the markers did not have a price on them.  Why is this an expression?  Write an expression that would help Ande figure out how much the total price was.  Let m represent your unknown variable.

Real – Life Situations  Hannah is 3 years younger than Katie. Joey is twice as old as Hannah. Let k stand for Katie’s age. Write an expression to represent Hannah’s age.  How old is Hannah if K = 10?  Let’s write an expression for Joey’s age?  How old is Joey? K - 3 2(K – 3)

Real – Life Situations  A wireless service provider charges $29.99 per month for service plus $0.10 for each text message. Write an expression using t that determines the cost.  What does the t represent? $ $0.10t where t = the number of text messages

Real – Life Situations  Saul’s father is working on a crew that will build a skyscraper in Yuma. He found out that each story is 13 feet tall. How tall, in feet, would the skyscraper be if it were 55 floors?  Write an expression to represent the height of a skyscraper with f stories: 13f where f = number of floors

Real – Life Situations  The rental fee for a mo-ped is $10 plus $3 for each hour the bike is used. Write an expression using h (hours) that determines the cost.  What would you spend if you rented the bike for 3 hours?

Real – Life Situations  Verizon charges $49.99 per month for service plus $0.15 for each picture message. Write an expression to represent the cost if p picture messages are sent. Be sure to explain what the variable represents. $ $0.15p where p = the number of picture messages sent

Real – Life Situations  On the first night of the school play, 586 people attended. On the second night, t people attended. Write an expression to show the attendance for the two nights. Be sure to explain the variable t where t = the attendance on the second night

Practice:  Write an algebraic expression to represent the sum of 16 and the product of 5 and a number. Identify the coefficient n; the coefficient is 5

Practice:  Write an algebraic expression to represent the difference of 16 and the product of 3 and a number. Identify the coefficient. 16 – 3n; the coefficient is 3

Real – Life Situations  Jalissa read twice as many books as Cristian read this month. Cristian read 3 more books this month than last month. Using b as the unknown, write an algebraic expression for the number of books Jalissa read this month. 2(b + 3)