(a) If Q is the point (x, 5in( (iii) (M (vii (vii) (viii) (ix) (X) (Xi) 1.5 1.7320 1.4 2.4373 1.3 1.2 1.1 0.5 0.6 0.7 0.8 0.9 1611 X D, find the slope of the secant line PQ (correct to four decimal places) for the following values of x