21. A sequence is shown below:9,= (-2):9,19,= 5Which function can be used todetermine the nth term?a. f(n) = -10(-2)-1b. f(n) = -2/5 - (5)"-1c. f(n) = 5(-2)-1d. f(n) = -5/2 · (-2)-1

21 A sequence is shown below9 2919 5Which function can be used todetermine the nth terma fn 1021b fn 25 51c fn 521d fn 52 21 class=