9. Suppose that a child gets $30 for his birthday. The child is spending money at a constant rate of $1.50 per day. a) Find a function that models the amount of money, M-f(t), the child has left, t days after the birthday. b) Find the coordinates of the vertical intercept (y-intercept). Interpret this point in context. c) Find the coordinates of the horizontal intercept (x-intercept). Interpret this point in context.

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