1-1 Variables and Expressions - Weebly

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LESSON Practice B

1-1 Variables and Expressions

Give two ways to write each algebraic expression in words.

1. 15 - b

2. x 16

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3. x + 9

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4. (2)(t)

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5. z - 7

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6. 4y

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7. Sophie's math class has 6 fewer boys than girls, and there are g girls. Write an expression for the number of boys.

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8. A computer printer can print 10 pages per minute. Write an expression for the number of pages the printer can print in m minutes.

Evaluate each expression for r = 8, s = 2, and t = 5.

9. st

10. r ? s

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11. s + t

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12. r - t

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13. r ? s

14. t - s

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15. Paula always withdraws 20 dollars more than she needs from the bank.

a. Write an expression for the amount of money Paula withdraws if she needs d dollars.

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b. Find the amount of money Paula withdraws if she needs 20, 60, and 75 dollars.

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Original content Copyright ? by Holt McDougal. Additions and changes to the original content are the responsibility of the instructor.

1-4

Holt McDougal Algebra 1

Answer Key

LESSON 1?1

Practice A

1. the sum of a and 3 2. 2 times x

3. y less than 5

4. the quotient of n and 4

5. 10 increased by t

6. the product of 3 and s

7. c + 2

8. 5m

9. 8

10. 4

11. 12

12. 3

13. 16

14. 8

15. a. j - 4

b.11 years old; 16 years old; 54 years old

Practice B

1. the difference of 15 and b; b less than 15

2. the quotient of x and 16; x divided by 16

3. the sum of x and 9; 9 more than x

4. the product of 2 and t; 2 times t

5. the difference of z and 7; 7 less than z

6. the product of 4 and y; 4 times y

7. g - 6

8. 10m

9. 10

10. 4

11. 7

12. 3

13. 16

14. 3

15. a. d + 20

b. 40 dollars; 80 dollars; 95 dollars

Practice C

1. the sum of k and 2.5; 2.5 more than k

2. the product of -5 and n; -5 times n

3. the quotient of b and 25; b divided by 25

4. the difference of 100 and x; x less than 100

5. 35g

6. 150 ? p

7. 14

8. 56

9.

1 7

10. a. 25 - 2g

b. 23 tokens; 17 tokens; 5 tokens; 1 token 11. n - 8, Possible answer: Tammy is 8 years younger than Nate, who is n years old

12. 4x, Possible answer: Bo had 4 times as many votes as Scott, who had x votes

Review for Mastery 1. 35m 3. c ? 25 5. r - 50 7. 10 9. 19

11. 12 13. 16 15. 9 17. 7

2. h - 0.5 4. 152 + b 6. 8 8. 29 10. 18 12. 18 14. 2 16. 36

Challenge 1. 70 + 0.35(m)

Expression for Plan A

40 + 0.45(200) 40 + 0.45(300) 40 + 0.45(400) 40 + 0.45(500)

Cost of Plan A $130 $175 $220 $265

Expression for Plan B

70 + 0.35(100) 70 + 0.35(200) 70 + 0.35(300) 70 + 0.35(400) 70 + 0.35(500)

Cost of Plan B $105 $140 $175 $210 $245

2. Plan A

3. Plan B

Original content Copyright ? by Holt McDougal. Additions and changes to the original content are the responsibility of the instructor.

A1

Holt McDougal Algebra 1

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