85, 86 and 87
It is neither. The concept of prime or composite is relevant for whole numbers greater than 1.
85, 86, 87
85 is a composite number because numbers other then 1 and itself equally go into it. 5 x 17 = 85, so 5 and 17 both go into 85 making it a composite number. (All numbers ending in 5 are composite, because 5 goes into them.)
Halfway between 70 and 100 is (70 + 100) ÷ 2 = 85.
The composite numbers are: 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, 86 ,87, 88
The odd numbers between 70 and 90 are 71, 73, 75, 77, 79, 81, 83, 85, 87, and 89. We know right away that 75 and 85 are composite, since they're divisible by 5. 81 is composite since it is the square of 9. 77 is obviously divisible by 11, so it, too, is composite. 87 is divisible by 3 since 8 + 7 = 15, which is divisible by 3. Therefore, and trust me, I double-checked the rest, 75, 77, 81, 85, and 87 are the composite, odd numbers between 70 and 90.
85, 86 and 87
160
For instance, all the even numbers greater than 70 are composite.The next few composite numbers greater than 70 are: 72, 74, 75, 76, 77, 78, 80, 81, 82, 84, 85, ...
There are no numbers between 70 and 85 that are less than 10. Not a single one. That goes for even numbers, odd numbers, mixed numbers, and decimals.
All of them except for 89 which is a prime number
It is neither. The concept of prime or composite is relevant for whole numbers greater than 1.
81, 82, 84, 85, 86, 87, 88. 80 and 90 are composite too
If you mean: 36 74 40 23 and 85 then they are all composite numbers except for 23 which is a prime number because it has only two factors which are itself and one
85, 86, 87
85 and 95 are both composite numbers because they have more than two factors