A function 
is even if 
, and is odd if 
.
Example:
is even, since 
.
is odd, since 
.
Example:
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2 answers:
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Answer:
Step-by-step explanation:
Let John's age be x. This gives us that in 11 years, john's age will be 5 less than 5 times his current age. Therefore, we could get: . This is your second equation. Solving for x, we get 4x=16 so x=4.