exam Maths Puzzle Numerical Ability

add or subtract as indicated. x/x+4-36/x^2-x-20

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exam Other Question

The following table list the years in which 3,4,5, and 6 billion.
1960 - 3 billion
1974 - 4 billion
1987 - 5 billion
1999 - 6 billion
a. Find an exponential model f
Use the compound interest formula above to compute the total amount after $3000 is invested at 4% over 2 years compounded daily. (Use n=360).