<u><em>Explanation:</em></u> <u>The function given is:</u> f (n+1) = -0.5 f (n)
<u>We are also given that:</u> first term is 120 <u>This means that:</u> f (1) = 120
<u>We will get the other terms by substitution as follows:</u> f (2) = -0.5 f (1) = -0.5(120) = -60 f (3) = -0.5 f(2) = -0.5(60) = 30 f (4) = -0.5 f(3) = -0.5(30) = -15 f (5) = -0.5 f(4) = -0.5(-15) = 7.5