Question

Which of the following numbers can be expressed as the sum of two composites? (i) 5 (ii) 15 (iii) 28
A) A) (i) and (ii) only
B) B) (i) and (iii) only
C) C) (ii) and (iii) only
D) D) None of the other choices.

Answer 1

how many ways can you add to numbers together to get 5?
5+0 5 is prime
4+1 1 is prime
3+2 both prime
so we cant write 5 as the sum of two composite numbers

Answer 2

a composite is any number greater than one that isn't prime.

Answer 3

So do?

Answer 4

d*

Answer 5

ok wait 1 is not composite

Answer 6

15=6+9 both composite

Answer 7

28 = 12+ 16 both composite

Answer 8

C)

Answer 9

5 cant
15 can
28 can

Answer 10

so in other words its c because you have to find two answers that have positive(other than 1) non prime(can be divided by only itself and 1) number that add up to them

Answer 11

Thank you guys so much!