Get ready before the bell rings! Take out homework and a pencil to prepare for the homework quiz! Check the file folder for your class to pick up graded work ◦ Located by the bookshelf, blue crate. ◦ Look behind the tab for your class period and take home anything with your name on it.

2.03 Evaluating Expressions

Example 1 If you drop an object, the object’s speed after t seconds is 32t feet per second. Suppose you drop a coin from a hot-air balloon over the desert. Find its speed after: ◦ 1 second ◦ 2 seconds ◦ 3 seconds ◦ 4 seconds ◦ 5 seconds

Example 1 Time t (seconds)Speed (feet/second) 132 (1) = (2) = (3) = (4) = (5) = 160 To evaluate an expression, replace the variable with the given number. The object’s speed after t seconds is 32t feet per second

For You to Do How fast does the coin travel after 5.5 seconds? After 1/8 of a second? Check your answers: 176 ft/s 4 ft/s The object’s speed after t seconds is 32t feet per second.

How does the height of the balloon affect the speed of an object that you drop from it?

Minds in Action Turn to page 99 in your textbook. Pair up with a partner. One of you read Sasha’s part of the dialogue and the other read Spiro’s. If Spiro chooses –2 as his starting number, what will his ending number be? 2 For Discussion

Check Your Understanding Turn to pages , and work independently on the following problems: # 2c, 4a and c, 5c, and 6b-e* *Recall the Order of Operations! Check answers: 2c. 10 4a. 5(3n – 2) 4c. 10 5c. 7/4 6b. (–3 + 3)∙ = 11 6c. –3 + 3 ∙ (5 + 11) = 45 6d. 25 – (5 + 4 ∙ 5) = 0 6e. 25 – (5 + 4) ∙ 5 = –20