Answer:
3
Step-by-step explanation:
a = first term = 17.2
tn = last term = 16.8
d= common difference = -0.2
n = number of terms = ?
To find the number of positive terms, we'll use the formula;
tn = a + (n - 1) d
Substituting the figures,
=> 16.8 = 17.2 + (n -1) -0.2
=> 16.8 - 17.2 = (n - 1) - 0.2
=> -0.4 = (n - 1) - 0.2
=> -0.4/-0.2 = n - 1
=> n - 1 = 2
=> n = 3
Therefore, the number of positive terms in the sequence is 3
