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Verified answer
A. 990 = 2 x 3² x 5 x 111089 = 3² x 11²
1111 = 11 x 101
FPB = 11
b. 70 = 2 x 5 x 7
85 = 5 x 17
115 = 5 x 23
FPB = 5
c. 264 = 2³ x 3 x 11
880 = 2⁴ x 5 x 11
FPB = 2³ = 8