21 A father makes a deal with his son regarding his weekly allowance. The first year, he agrees to pay his son a weekly allowance of $10. Every subsequent year, the allowance is recalculated by doubling the previous year's weekly allowance and then subtracting 8. Which recursive formula could be used to calculate the son's weekly allowance in future years? (1) a = 2n-8 (2) a₁, = 2(n+1)-8 (3) a₁ = 10 an+1=2a₁-8 (4) a₁ = 10 an+1 = 2(a₁ - 8)

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