For example, if Jimmy starts out with $15 and earns $2 a day, the explicit expression “2? + 15” can be described recursively (either in writing or verbally) as “to find out how much money Jimmy will have tomorrow, you add $2 to his total today

For example, if Jimmy starts out with $15 and earns $2 a day, the explicit expression “2? + 15” can be described recursively (either in writing or verbally) as “to find out how much money Jimmy will have tomorrow, you add $2 to his total today.” ?ₙ = ?ₙ₋₁ + 2, ?₀ = 15