If r is even and t is odd, which of the following is odd? Choose the correct choice from the following options
A) rt B) 5rt C) 6(r^2)t D) 5r + 6t E) 6r + 5t
R is even, A B and C are out a even number multiplied by any number is even.   D is out because 5r = even, 6t =even so even + even = even   E is correct because: 6r = even, 5t = odd as any number of the form odd x integer... the integer value determines the even/odd nature.   so, even + odd = odd ;Answer: 6r + 5t
<result>E</result>
If r is even and t is odd, which of the following is odd?