a1 = -4
a2 = -2
d = -2 + 4 = 2
a10 = a1 + 9d = -4 + 18 = 14
S10 = -4 + 14/2 * 10 = 50
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a1 = -4
a2 = -2
d = -2 + 4 = 2
a10 = a1 + 9d = -4 + 18 = 14
S10 = -4 + 14/2 * 10 = 50