book Maths Puzzle Numerical Ability

A baseball is hit. Its heigh above the playing field is measured by a sensor. Write an equation to describe the curve of best fit for the data collected by the sensor.
Time, x (s

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book Other Question

Ok can you help me with this one?
"Use the discriminant to determine whether the vertex of the graph of the function 6x^2-2x+4 below lies above, below, or on the x-axis."
Construct a scatter diagram of the following data treating year as independent variable and mobile phone usage (in millions) as dependent variable.

Year, t