book Maths Puzzle Numerical Ability

solve -X* + 8X = 0 by completing the square ( answer must be 2 points to go into graph)

also -X* + 8X = 0 using Quadratic Formula

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book Other Question

Solution A = 1 cc water
Solution B = 1 mg salt
Solution C = Solution A + B ( 1cc to 1 mg )
Solution D = Solution 3cc of water + solution B

How much of solution D is needed to adam took 7 test scores and divided the correct sum by 6 which yielded 84. what is the correct average test score?