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F(1)=8,   f(2)=4,   f(3)=0,   f(4)=-4,   f(5)=-8 f(1)=2,   f(2)=2,   f(3)=4.5, f(4)=8, f(5)= 12.5 recursive- f(1)=2, f(n)=f(n-1)-2         explicit- f(n)=2-2n , f(20)=36 recursive- f(1)=45, f(n)=f(n-1)+10     explicit- f(n)=55+10n , f(20)=235 explicit- f(n)=45+15n, tina will have $255two ways of representing arithmetic sequences are by explicit and recursive equations.