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Verified answer
U3 = a + 2b = 9a = 9 - 2b
u5 + u7 = 2a + 10b = 36
a = 18 - 5b
18 - 5b = 9 - 2b
-5b + 2b = 9 - 18
-3b = -9
b = -9/-3
b = 3
a = 18 - 5x3 = 3
Un = 3n
U10 = 30
S10 = 10/2 x (3+30) = 5 x 33 = 165