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u7 = 37
u7 = u3 + 4b
37 = 9 + 4b
28 = 4b
b=7
u30 = u7 + 23b
= 37 + 161
= 198
U7=a+6b=37
U3=a+2b=9
--------------------- -
4b=28
b=28/4
b=7
a+2b=9
a+2.7=9
a=9-14
a=-5
Sn=n/2(2a+(n-1)b)
S30=30/2(2(-5)+(30-1)7)
S30=15(-10+203)
S30=15 (193)
S30=2895