Which statement is true about 513?
A. It is a prime number.
B. It is a composite number.
C. It is a whole number that is neither prime nor composite.
D. It is not a whole number.

Question

Which statement is true about 513?
	A.	It is a prime number.
	B.	It is a composite number.
	C.	It is a whole number that is neither prime nor composite.
	D.	It is not a whole number.

michele_laino · Answer

hint:
we can write this: $513:3=171$

anonymous · Answer

Which pair of numbers is relatively prime? 
	A.	30 and 138
	B.	34 and 137
	C.	318 and 1443
	D.	3000 and 30,616

michele_laino · Answer

hint:
$30$ and $138$ are both divisible by $2$
$318$ and $1443$ are both divisible by $3$
$3000$ and $30616$ are both divisible by $2$
$34$ is divisible by $2$ and by $17$, whereas $137$ is not divisible by $2$, it is not divisible by $ 17$