Question

To convert dog years to human year, count 21 human years for the first two dog years and then 4 human years per dog year for each dog year thereafter. Write an expression that represents the human age of a dog that is Y dog years old, where Y is greater than 2.

Answer 1

(y-2)4 + 21
You subtract two because the 21 accounts for it and then whatever you have left multiplied by 4 and added to 21 is the amount of years after conversion.







*************************************************

Answer 2

Answer: Hello mate!

We know that Y is greater than 2, then we can write Y as X + 2, where X is a number greater than 0.

Then X is the number of years that passed since the second year.

We know that the first two years are equivalent to 21 years, and each year since then is equivalent to 4 human years

Then the equation that represents the dog's age in human years is

A(X) = X*4 + 21

where we used X instead of Y, because we change the first two years of Y for that constant  21.