1- 30cm

2- chica 12,mediana 24,grande 48

3- ?

4- c

5- b

6- 55 mins

7- 75 m

8- 180-200km/hrs

9- x=-10

10- x=102

11- x=-3

12- x=2.14

13- x=25.3

14- ?

15- x=2.1

16- x=28.8

17- x=.5/6.19

18- x=16

19- x=2

20- x=337.5