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6. The population of a Canadian city is modeled by P(t) = 0.4t* + 10t + 50, where P(t) is the population in thousands and t is the time in years since the year 1995. a) What will be the population in 2010? b) In what year will the population be at least 450 000? H4. Determine the equation in standard form for the quadratic function with x-intercepts -2+v5 , containing the point (-4, 5) 5. The path of an underground stream is given by the function y = 4x2 + 17x -32. Two new houses need wells to be dug. On the area plan, these houses lie on a line defined by the equation y = -15x + 100. Determine the coordinates where the two new wells should be dug. H2. State the domain and range of the following relations and then state if it is a function or not. 1 I a) X = 12 + 1 545 6 7 5 7 b) Is it a function or not? { (1, 4) , (2, 6), (3, 10) , (4, 18), (5, 29) }