- anonymous

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?

- jamiebookeater

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- anonymous

do you know what "composite number" means ?

- anonymous

##### 1 Attachment

- anonymous

no

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## More answers

- anonymous

lol then you can't do it !

- anonymous

but i will tell you

- 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

- anonymous

does that help?

- anonymous

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

- 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

- anonymous

oh so sorta like odd and even?

- 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

- 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?

- anonymous

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

- anonymous

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

- 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

- anonymous

idk what the answer is tho

- anonymous

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

- anonymous

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

- anonymous

well i know how to count lol

- 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

- anonymous

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

- anonymous

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

- 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

- anonymous

then i guess i might as well forget it then

- anonymous

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

- anonymous

prime?

- anonymous

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

- anonymous

how about 5?

- anonymous

composite

- anonymous

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

- anonymous

6?

- anonymous

composite

- anonymous

yers!

- anonymous

7?

- anonymous

prime?

- anonymous

yes 8?

- anonymous

composite

- anonymous

yes
9? (we did this one)

- anonymous

composite

- anonymous

whew yes
10?

- anonymous

composite

- anonymous

yes
11

- anonymous

prime

- anonymous

yes
12

- anonymous

composite

- anonymous

ok now we are almost done!!

- anonymous

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

- anonymous

how many 4's inside the table?

- anonymous

3?

- anonymous

yes good
how many 6's?

- anonymous

2

- anonymous

hmm no count again

- anonymous

3

- anonymous

keep counting

- anonymous

oh 4

- anonymous

there are more than 3 sixes in the table

- anonymous

5

- anonymous

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

- anonymous

how many 8's

- anonymous

2

- anonymous

hmm no
all the 8's on a diagonal

- anonymous

4

- anonymous

nope

- anonymous

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

- 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

- anonymous

enjoy the bon fire

- anonymous

thx

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