Can anyone help explain how to do #59, showing how a negative growth rate affects the equation for an exponential model?

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To explain how a negative growth rate affects the equation for an exponential model consider exponential growth or exponential decay which occurs in Oman and Paraguay (as per the image in the question). There is an indirectly proportional relation between the growth rate and the current value of the function...

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To explain how a negative growth rate affects the equation for an exponential model consider exponential growth or exponential decay which occurs in Oman and Paraguay (as per the image in the question). There is an indirectly proportional relation between the growth rate and the current value of the function created in the comparison. 

Therefore, in this scenario, a negative growth rate will show that  as the value of time increases (if the trend continues) (x-axis) say 1 year, 2 years, 3 years and so on, the monetary value decreases (y-axis), for Oman say $20,3 billion, $18,6 billion and so on. 

Please repost #59b) separately, in terms of eNotes rules which does not allow multiple questions. 

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