This is simple to figure out: Add all of those numbers together and then divide it by how many numbers you added up. Use a caculator if you have to.
If you mean: 9, 19, 39, 69 then the next number in the sequence is 109
No, 69/3 = 23 so it's not a prime number
69
69 is already a whole number. A whole number is an integer without a fraction.
No, 69 is not a square number.
69
69-69-69 ;)
This is simple to figure out: Add all of those numbers together and then divide it by how many numbers you added up. Use a caculator if you have to.
69 is a composite number because it is a multiple of 3 and 23.
69 is the number after 68 and the number before 70
That means a number of items counting from 1 to 69.
69!
If you mean: 9, 19, 39, 69 then the next number in the sequence is 109
69 = 69.0
No, 69/3 = 23 so it's not a prime number
69