Question

John was 5 years old when his pet dog, Spot, was born.

Use your equation to calculate how old John will be when Spot has his 4th birthday. Write only the final answer the number.

Answer 1

Explanation:

S = age of Spot

J(S) = the age of John, when Spot is S years old.

J(S) = S + 5

J(0) when Spot was born = 0 + 5 = 5

J(4) when Spot has 4th birthday = 4 + 5 = 9

John will be 9 years old.