All of them except for 11, 13, 17 and 19 which are prime numbers
12 is a comsite number between 10 and 20 :)
20 is between 10 and 30.
10
18
There are 4 numbers that are prime between the number 10 and 20. They are 11, 13, 17, and 19.
20
10
10
(10+20)/2 = 30/2 = 15
15
it is 17
10 < x + 5 < 20
12
13
30
The difference between the greatest and least number is the range. For example, if the greatest # in a set of data is 20, and the least # is 10, 20-10=10. 10 is the range.
21