Why does the number 17 not belong with 26, 44, & 65

17 does not belong to the other numbers because it is a prime number and they are composite numbers.

A prime number is a number that can only be divided by 1 and the number itself.

The following are prime numbers:  2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59.

The rest are composite numbers which means that they can be divided by another number apart from 1 and the number itself.

In conclusion,17 is a prime number and the rest aren't.

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17 is a prime number whereas 26,44 and 65 are the composite numbers.

Step-by-step explanation:

The number 17 does not belong with 26, 44 and 65.

Here 26 is divisible by 2 and 13.

44 is divisible by 2, 4 and 11.

65 is divisible by 5 and 13

But 17 is divisible by 1 and itself, that is it's a prime number, whereas the other numbers 26, 44 and 65 is divided by 1, itself and also by other numbers.

So 17 is a prime number whereas the 65, 26 and 44 are composite numbers.

5x+40

5(x + 8)

7x - 49

7(x - 7)

18x + 9

9(2x + 1)

15x - 10

5(3x - 2)

step-by-step explanation:

for number one all you have to do is factor 5 out of 5x + 40

for number 2 factor 7 out of 7x - 49

for number three factor 9 out of 18x + 9

for number four factor 5 out of 15x - 10