exam Maths Puzzle Numerical Ability

a cd subscription offers an introductory offer of 12 cd's for 1 cent.cd's purchased there after are $15.98 each. How do I set up the equation for this problem?

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exam Other Question

what is the answer to sqrt(x-1)=3? A triangular tent is 5ft by 7 ft and 7ft at the peak. What is the surface area and volume?