1) f(1) = 0 ; f(2) = 1 ; f(n) = f(n-1) + f(n-2) , for n > 2
f(3) = f(3-1) + f(3-2) = f(2) + f(1) = 1 + 0 = 1
f(4) = f(4-1) + (4-2) = f(3) + f(2) = 1 + 1 = 2
f(5) = f(5-1) + (5-2) + f(4) + f(3) = 2 + 1 = 3
1st five terms of the sequence are 0, 1, 1, 2, 3
2) There is no graph. This question can't be answered.
3) C. This is the average number of days the house stayed on the market before being sold for $250,000.