## anonymous one year ago 1. The possible outcomes for rolling a pair of fair dice are shown below. What is the probability of rolling a sum that is a composite number?

1. anonymous

do you know what "composite number" means ?

2. anonymous

3. anonymous

no

4. anonymous

lol then you can't do it !

5. anonymous

but i will tell you

6. anonymous

a composite number is a whole number that can be written as a product of two other whole numbers (not including itself and 1) another way to say it is a composite number is NOT a prime number

7. anonymous

does that help?

8. anonymous

i never understood composite and prime numbers no matter how much sombody tried to explain it to me

9. anonymous

here is an example 6 is composite because $$6=3\times 2$$ 7 in prime, because it only has itself and 1 as a factor

10. anonymous

oh so sorta like odd and even?

11. anonymous

that is really all there is to it the only part that might be confusing is that 1 is not prime or composite, and 2 is prime yeah sort of but even odd only means divisible by 2 9 is composite because $$9=3\times 3$$ but it is not even

12. anonymous

the numbers you have to consider are $\{2,3,4,5,6,7,8,9,10,11,12\}$ can you tell which ones of those are composite and which are prime?

13. anonymous

the choices for my question are A:7/12, B:1/2,C:5/12,and D:1/12

14. anonymous

i forgot to put those up when i asked the question sorry

15. anonymous

i am not interested in choices particularly more interested in if you know which numbers are composite then it is only a matter of counting

16. anonymous

idk what the answer is tho

17. anonymous

let me ask one more time of the numbers $\{2,3,4,5,6,7,8,9,10,11,12\}$ which are composite?

18. anonymous

that is all you need to know to do this that, and how to count

19. anonymous

well i know how to count lol

20. anonymous

the reason im trying to get the answer is cause studyisland closes tomorrow and i need the answer as fast as i can get it and im under alot of pressure i only have 5 more days of school to get my grade up

21. anonymous

name the composite numbers, we get the answer in two seconds after you name them study island? geez

22. anonymous

im in seventh grade its alot harder they make us do like 9th grade work

23. anonymous

i will show you what do do as soon as you name the composite numbers if you cannot do that, there is no way you can do this question, might as well forget it

24. anonymous

then i guess i might as well forget it then

25. anonymous

want to take them one at a time? i will start 2 is prime 3 is prime how about 4?

26. anonymous

prime?

27. anonymous

no $$4=2\times 2$$ all even numbers except 2 are composite

28. anonymous

29. anonymous

composite

30. anonymous

no 5 is prime, it has no factors other than 1 and 5

31. anonymous

6?

32. anonymous

composite

33. anonymous

yers!

34. anonymous

7?

35. anonymous

prime?

36. anonymous

yes 8?

37. anonymous

composite

38. anonymous

yes 9? (we did this one)

39. anonymous

composite

40. anonymous

whew yes 10?

41. anonymous

composite

42. anonymous

yes 11

43. anonymous

prime

44. anonymous

yes 12

45. anonymous

composite

46. anonymous

ok now we are almost done!!

47. anonymous

we list the composite numbers, then count how man times we see them in the table you posted they are $\{4,6,8,9,10,12\}$

48. anonymous

how many 4's inside the table?

49. anonymous

3?

50. anonymous

yes good how many 6's?

51. anonymous

2

52. anonymous

hmm no count again

53. anonymous

3

54. anonymous

keep counting

55. anonymous

oh 4

56. anonymous

there are more than 3 sixes in the table

57. anonymous

5

58. anonymous

there are more than 4 they all lie on a diagonal right 5

59. anonymous

how many 8's

60. anonymous

2

61. anonymous

hmm no all the 8's on a diagonal

62. anonymous

4

63. anonymous

nope

64. anonymous

counting was supposed to be the easy part do you see all five 8's?

65. anonymous

igtg my moms taking me to a bon fire but i will be working on this later but thank you for your time and effort and im sorry was any trouble but it was nice talking to u bye

66. anonymous

enjoy the bon fire

67. anonymous

thx