. Below are sinusoidal regressions created from the average monthly low temperatures in Iqaluit, Nunavut and Nairobi, Kenya. Compare the amplitudes of these functions – what do they mean in this context? Give one or two sentences that describe the implications of these two amplitude values. (2 marks)  Iqaluit: = 18.63 sin 0.50( + 170.45) − 13.34  Nairobi: = −1.50 sin 0.77( + 51.25) + 12.86 88 points

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if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this