*30 points*
the sum of any two prime numbers except the number
2 must be which of the following?
a. prime number
b. perfect square
c. even number
d. odd number
e. a multiple of 3
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C)   The sum of any two prime numbers except the number  2 must be an EVEN NUMBER.

Step-by-step explanation:

Prime numbers: A number is said to be a prime number if the only factors of the number are  1 and the number itself.

⇒  2 is NOT a factor of the prime number except for 2.

⇒ ALL PRIME NUMBERS ARE ODD except for 2.

Now, SUM OF ANY TWO ODD  NUMBERS IS  ALWAYS GET AN EVEN NUMBER.

⇒ If we add any two prime numbers other then 2, sum will always be even.

Hence, The sum of any two prime numbers except the number

2 must be EVEN NUMBER.

step-by-step explanation: a reaction is first order. if the initial reactant concentration is 0.0200 m, and 25.0 days later the concentration is 6.25 x 10-4 m, then its half-life is:

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step-by-step explanation: