✓ Lesson Check

Do you know HOW?

1. Is each expression algebraic or numerical?
   1. 7 ÷ 2 7 divides 2
   2. 4 m + 6 4 m plus 6
   3. 2 ( 5 − 4 ) 2 open 5 minus 4 close
2. What is an algebraic expression for each phrase?
   1. the product of 9 and a number t
   2. the difference of a number x and 1 2 1 half
   3. the sum of a number m and 7.1
   4. the quotient of 207 and a number n

Use words to describe each algebraic expression.

3. 6c
4. x − 1 x minus 1
5. t 2 t over 2
6. 3 t − 4 3 t minus 4

Do you UNDERSTAND?

7. Vocabulary Explain the difference between numerical expressions and algebraic expressions.
8. Reasoning Use the table to decide whether 49 n + 0.75  or  49 + 0.75 n 49 n plus , 0.75 , or , 49 plus , 0.75 , n  represents the total cost to rent a truck that you drive n miles.

   Truck Rental Fees

   Number of Miles	Cost
   1	$ 49 + ( $ . 75 × 1 ) dollars 49 plus open dollars . 75 times 1 close
   2	$ 49 + ( $ . 75 × 2 ) dollars 49 plus open dollars . 75 times 2 close
   3	$ 49 + ( $ . 75 × 3 ) dollars 49 plus open dollars . 75 times 3 close
   n	□ white square