exam Maths Puzzle Numerical Ability

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Li Teng is ordering graduation announcements for the senior class. If 100 announcements are ordered, the cost is $255. The cost for

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exam Other Question
an object is projected upward from the top of a tower. its distance in feet above the ground after t seconds is given by s(t)=-16t^2+64t+80. how many seconds to reach ground level? complex fractions

4 + 2 over x over x over 4+ 1 over 8