Question

I GIVE MEDALS
Cynthia made the conjecture that the sum of any prime number and any composite number is a composite number.

Which equation is a counterexample to her conjecture?

A.
5 + 8 = 13

B.
13 + 2 = 15

C.
11 + 2 = 13

D.
11 + 9 = 20

Answer 1

can u help me @blurbendy

Answer 2

do you know what prime and composite numbers are?

Answer 3

yes

Answer 4

okay, which of the solutions end with a composite number

Answer 5

a,c

Answer 6

13 is prime, not composite

Answer 7

i mean D

Answer 8

same with B, 15 is composite. However, we need to find a counter example, so our answer will be either A or C

Answer 9

which of them is adding a prime and a composite?

Answer 10

a?

Answer 11

Good, A is correct

Answer 12

thank u so much :)

Answer 13

yw