exam Maths Puzzle Numerical Ability

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)

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exam Other Question

from a 100 foot roof of a building on the coast, a tourist sights a ship. the angle of depression is 2.5 degrees. how far is the ship from the shoreline?
i put x/100 = tan 2.5 degress than cross multiplied and got 4.4 feet. id that right? 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?