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$\newline$$21$$\newline$$22$$\newline$(From Unit $1$, Lesson $6$.)$\newline$Here is a recursive definition for a sequence $f: f(0)=15, f(n)=f(n-1)-4$ for $n \geq 1$. The definition for the $n^{\text {th }}$ term is $f(n)=15-4 \cdot n$ for $n \geq 0$.$\newline$a. Explain how you know that these definitions represent the same sequence $23$$\newline$b. Select a definition to calculate $f(25)$, and explain why you chose it.$\newline$(From Unit $1$, Lesson $8$.)$\newline$$24$$\newline$$21$. Enter the part of the recursive equation that describes the starting term.$\newline$Type a response