If k is an integer and r = k2 + 3k + 9, which of the following statements about r must be true for all values of k? A. r is even
B. r is divided by 3
C. r is the square of an integer
D. None

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  D. None

Step-by-step explanation:

If one of these is true for all values of k, we can see it for k=1.

 r = 1² +3·1 +9 = 13

This value is not even, not divisible by 3, and not the square of an integer.

None of the offered statements about r is true.

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step-by-step explanation:

not only in mathematics, scientific proof also are required in the other field of science. also maths proofs are of particular structure, containing steps and logics. so proving is like doing science, it is science. that's why it is important to prove. 

an inaccurate proof leads to errors, or stating results that are not accurate.  which wil mess the probelm up you dont want this