1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Using the formula for the nth term of an arithmetic progression.
an = a + (n - 1)d
a(4) = a + 3d = 55
a(9) = a + 8d = 90
a(9) - a(4) => 5d = 35
d = 35/5 = 7.
From a(4): a = 55 - 3d = 55 - 3(7) = 55 - 21 = 34
a(2) = a + d = 34 + 7 = 41.
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Step-by-step explanation:
-1,355= -1355/1000
-1,352= -1352/1000
