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-5 = -2m + 5
2m = 10
m = 5
U1 = 4m + 2 = 22
U2 = 4m - 3 = 17
U3 = 2m + 2 = 12
a = 22
b = 17 - 22 = -5
U10 = a + 9b = 22 + 9(-5) = 22 - 45 = -23
S10 = 10/2 (2a + 9b)
= 5 (44 - 45)
= 5 (-1)
= -5
-5 = -2m + 5
2m = 10
m = 5
U1 = 4m + 2 = 22
U2 = 4m - 3 = 17
U3 = 2m + 2 = 12
a = 22
b = 17 - 22 = -5
U10 = a + 9b = 22 + 9(-5) = 22 - 45 = -23