Answer:
13. D.
14. C.
15. B.
16. D.
17. C.
18. D.
19. D.
20. A.
Step-by-step explanation:
13. All even numbers except 2 are COMPOSITE NUMBERS.
2 is the only even PRIME NUMBER
14. 29, 21, 37, 41, and 43 has only 2 factors, 1 and itself
9 is not a Prime Number, It's a Composite Number because it has 3 factors:
( 1, 3, and 9)
15. 8, 14, 15, 16, and 20 has more than 2 factors.
16. GCF: 8
17. 12 and 18 has a GCF of 6 because the other choices is not divisible nor has no factor 6.
18. 9 and 18 has the LCM of 9
The others may be divisible by 9 but we are finding the Least
19. 6 and 9 has a LCM of 18
20. You can see a number is divided by 5 if the ones digit is 5 or 0
While you can see a number is divided by 10 if the ones digit is 0
So the answer is A. 550
Hope it helps!
