exam Maths Puzzle Numerical Ability

Data regarding the value of a particular color copier is represented in the graph. Find the rate of change of the value with respect to time,

(1, 3) and (3, 1)

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exam Other Question

When 2 is subtracted from the numerator and 1 is added to the denominator of a positive fraction the result is 5. Find the fraction given that it lies between 7 and 8. I need to figure out what "compounded annually" means. Ex: $500 paying 4% interest compounded annually. What does this mean?