Step-by-step explanation:
the first thing we notice is that f(1) is different for the 3rd recursive function.
so, ha, the correct explicit function is -3n + 12 (the right option). no other delivers 9 for n = 1.
then we see that the first recursive function creates growing terms of the sequence (always adding 2).
so, only 2n + 6 (the left option) can be correct. the bigger n, the bigger the functional value.
and the second recursive function creates decreasing, shrinking terms of the sequence (always subtracting 2).
so, only -2n + 10 (the middle option) can be correct. the bigger n, the smaller the functional value.
so, the correct marks are like a diagonal from top left to bottom right ...
