1. 3x + 7 = -2x 5 x = -2.

2. .

. 7x + 4 = 18 . (3 +5) 2 1 = 6( 1 ) + 15 . 4(4 + 2) = 10 +20

3. . a .

i. 7x + 4 = 40 5x ii. 7( 3x 4 ) + 5 = 10( x + 1)

4.

3 15 2 10

x x x = 4

5. .

3 + 1 = 7 0

2(+1) = 2 2 4 + 7 + 1 = 3 + 5 + 4

2011 + 1 = 1 2

6. ) 4 + 1 < 2 + 7 ) 2( 2 ) > 5 20

7.

5 1 < 9 3 + 4 < 5 + 6

1 4

8. . 9. () ()

) = ) + = + ) ( )2 =

10. , .

11. .

12.

. ) y = 2x B) y = - 5x ) y = ()x

13.

14. .

2 4

15. .

5 m

12 m 8 cm

17 cm

16. 10cm

8 cm , .

8 cm

10 cm

17. ) ) )

18.

5 3

1 4 3

3 4

19.

30 45 60

20.

.

21.

140

100

22. .

23.

, : A) = 7cm B) = 40 m

24.

15,7 cm.

25. 314 mm2.

2 cm 26. .

4 4