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Suppose a man is dead at the age $90$ its was the $2009$ , and what would be the age when its was $1986$

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Exponential growth and decay: word problems

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Q. Suppose a man is dead at the age

90

its was the

2009

, and what would be the age when its was

1986

Calculate man's age in $1986$ : Now, calculate the man's age in $1986$ by subtracting the year of birth from the year $1986$ . Calculation: $1986 - 1919 = 67$
Check calculation for errors: Check the calculation for any mathematical errors. $\newline$ Re-checking: $2009 - 90 = 1919$ (correct) and $1986 - 1919 = 67$ (correct)

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