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just some extra advice, when ur looking at any sort or annuity or interest question pay close attention to when the interest is compounded and how many periods there are. Eg. if the questions says 12%p.a. compounded monthly over 3 years. r = 0.12/12 (which gives monthly rate)...

i dropped from advanced to general earlier this year, and that formula is used to determine the point of symmetry. e.g. -b/2a finds the x value, and then u need to sub that x value into original function to find the y value and thus u have ur point of symmetry.