exam Maths Puzzle Numerical Ability

im looking for the slope in percent of PH BUFFER SOLUTIONS. The readings are 4.00, 7.02, and 10.07. my question is what is the slope percent? Can you help me?

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exam Other Question
How do I find the equation of the axis of symmetry for a parabola that contains the points (-2,6), (6,6), and (0,6) Solve x2 - 6x + 8 = 0 by quadratic equation?