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b = (29 -13) : (7-3)
b = 4
a = 13 - (4.2)
a = 5
Sn = n/2 (2a + (n-1)b)
S25 = 25/2 (2.5 + (25-1)4)
S25 = 25/2 (10 + (24.4))
S25 = 25/2 (10 + 96)
S25 = 25/2 (106)
S25 = 25.53
S25 = 1325