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"**"\"'*** '** '***"\"'* v" "**'*V'*'\" "* r'"* ' '*""'* " "***'* '*** "* vW' ""'* \\il 13 P2: A quadratic function y = ax2 + bx + c intersects the points with coordinates (0,18), I - (1,10) and (3, 30) a Find the values of a,b and c. (5) b Solve the equation ax2 + bx +c = 0. (3) c Hence write down the equation of the line of symmetry of the graph of y = ax2 + bx + c. (2) 14 P2: The following table illustrates the weekly book sales from an independent book seller on a I selection of six different weeks over the course of one year (52 weeks). : Find the best t cubic equation that models this data. (3) b Comment on the suitability of the best fit equation from part a as a model for the given data. (2) c Using this model, find the week in which the book seller can expect to sell the most books, and state the number of books they can expect to sell in that week. (2) d Find the week in which the book seller can expect to sell the least quantity books, and state the number of books they can expect to sell in that week. (2) e Find the number of weeks per year that the book seller can expect to sell over 250 books. (3)