2. which conjecture is true? a. an even number plus 3 is always even. b. an even number plus 3 is always prime. c. an even number plus 3 is always odd. d. a prime number plus 3 is always even

The answer is C. A way to find out is to add a few numbers from that group being specified. If you add 2 or even 100 to 3, the answer will be odd. If you add 12 to 3, you will get 15 which is a composite number. If you were to add 2 to 3, you will get 5 which is an odd number.

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