Evaluating Expressions Real World Examples Page 2 & 4 in Practice Workbook

Page 2, #22 A side table has interior storage space in the shape of a cube. What is the volume of the storage space if the interior length is 12 inches? V = Bh V = lwh V = (12)(12)(12) V= 1728

Page 2, #23 There are 52 playing cards in a standard deck of playing cards. You are combining decks of cards so that you can play ba game with a large number of people. The expression 52d represents the number of cards in d decks. If you combine 4 decks of cards, ow manu cards will you have all together? 52d 52(4) = 208 cards

Page 2, #24 An item costs c dollars and 6% sales tax is charged. The total cost including sales tax is given by the expression 1.06c. You are buying a skateboard that costs $75. What is the cost of the skateboard including sales tax? 1.06c 1.06 (75) = $79.50

Page 4, #24 Three weeks ago, an art supply store started selling a paint kit for 75% of the original price. Now the kit is 15% off of the sale price. The expression.75x – 0.15(0.75x) represents the current price of the paint kit where x is the kit’s original price (in dollars). Find the current price if the kit originally cost $48 represents the current price of the paint kit where x is the kit’s original price (in dollars). Find the current price if the kit originally cost $48

Page 4, #24 (continued).75x – 0.15(0.75x).75 (48) – 0.15(0.75)(48) 36 – – Since this is money, we say $30.60

Page 4, #25 You are decorating the perimeter of the ceiling of your living room with crown molding. The expression 2x + 2y represents the total amount of molding you need where x is the width of the room (in feet) and y is the length of the room (in feet). Find the total amount of wood you need if the room is 11 feet wide and 10.5 feet long.

Page 4, #25 (continued) 2x + 2y 2(11) + 2 (10.5) inches

Evaluating Expressions “Self Check” 1. Login to Moodle: moodle.nisdtx.org 2. Go to your Algebra I – L.Tatum site 3. Click the first Homework link 4. Take the Self Check 5. Save it when you finish

Translating Let’s look at translating verbal phrases into expressions

The difference of 9 and a number n 9 - n

The product of 9 and a number n 9n

A number decreased by 4 n - 4

15 more than a number 15 + n

Three times the sum of 8 and a number 3(8+n)

25 more than twice a number m

For More Practice Use the Animated/ Interactive activity in Classzone

Words for Operators We discovered that many different words are used to indicate operations.

Add Increase sum plus total all together Subtract Decrease difference minus less Less than (switch) Lowerdescend MultiplyProduct OF times Double or twice (x2) Divide Quotiient share equally divide Half (divide by 2) Create this table in your notebook Think of all the “other words” we could use to mean the same thing