Which is a counterexample to this conjecture?

the sum of any two consecutive integers is a composite number.

a.
16 + 17 = 33

b.
10 + 11 = 21

c.
6 + 7 = 13

d.

7 + 8 = 15

Abaker makes 186 cookies. some are chocolate chip and some are oatmeal raisin, and both kinds are made with and without nuts, as shown in the table above. because they are more popular, the baker made 2/3 of the cookies chocolate chip. if a chocolate chip cookie is chosen at random, what is the probability that it will have nuts? a) 21/93 b) 21/62 c) 41/93 d) 21/41

Julius sold five times as many computers as sam sold last year. in total, they sold 78 computers. how many computers did julius sell?

Sarah used her calculator to find sin 125 degrees. she wrote down sin sin125 degrees.57. how could sarah recognize that her answer is incorrect?