Idiot\'s Guides Basic Math and Pre-Algebra

302 Appendix A

9. 3t^2 (-8t^5 ) = -24t^7


10. 7z(3z + 5)= 21z^2 + 35z


11. -^145 -
    7

t 2 t

12.^1111

3

2

a

a

 a, a^ {^0

13.^18

6

3

4

3

x

x

 x, x^ {^0

14.^42

14

3

7

4

y 3

y

 y, y^ {^0

15.

(^318) x^2 x 8
x { 0

Chapter 9

1. 4x is a term.


2. -12 is a term.


3. -2t^7 is a term.
   4.^6
   y
   is not a term.


4. a
   6

is a term.

6. 7y^2 and 11y are unlike.


7. 3t^2 and 5t^2 are like.


8. 2x and 7x are like.


9. -9a^2 and -15a^3 are unlike.


10. 132x^3 and -83x^3 are like.


11. 
    
    
    
    • 4x + 9x = 5x
    
    
    
    


12. 3a^2 – 2a^3 is not possible.

12 72 32

4

12

4

72

4

32

4

xx x^32 3 2

x

x

x

x

x

x

x

 

28. The change was an increase of 8.5 – 8 = 0.5
    pounds.

The dog’s weight increased 6.25%.

29. The decrease was 180 – 150 = 30 pounds.

His weight decreased 162
3

%.

30. The increase is 2 – 1.5 = 0.5 quarts.

There was 331
3

% more ice cream.

Chapter 8

1. x
   12
   4


2. t19 22


3. nn 3  154


4. y y^584 


5. p
   p 1

 2



6. 5(-6a) = -30a


7. x(4x^2 ) = 4x^3


8. 2y(-5y^3 ) = -10y^4

0.5

8 100

8 x 50

6.25

x

x







30

180 100

180 3000

162

3

x

x

x







0.5

1.5 100

1.5x 50

33.3

x

x