Which number below is a prime number?
O A. 18
O B. 12
O c. 17
O D. 28

C 17

Step-by-step explanation:

A. 18  = 2*9  so not prime

B. 12  = 3*4 so not prime

c. 17  

D. 28 = 4*7 so not prime

17 = 1*17 so the only numbers are 1 and itself so it is prime

answer:  

123455421

step-by-step explanation: easy

false

step-by-step explanation:

the reason i say this is because for a certain length of sides you can pick any two and the length is wither equal or greater than the third side and in this case it's not.

3 + 5 = 8

8 is smaller than 9 which is the third side.

hope this : )