exam Maths Puzzle Numerical Ability

5x+3
If f(x)=----, then f(c+2)=
x+5

NOTE 5x+3 is divied by x+5

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1. Do exponential functions only model phenomena that grow, or can they also model phenomena that decay? Explain what is different in the form of th How long does it take an investment to double if it grows according to the formula V=537e^.015t? Assume t is in years? (^ is used to show that e has been raised to the .015t power).