Answer
(a) True
(b) True
Work Step by Step
(a) True: $\frac{7}{11}=\frac{7*13}{11*13}=\frac{91}{143}>\frac{88}{143}=\frac{8}{13}$
(b) True: $-\frac{3}{5}=-\frac{3*4}{5*4}=-\frac{12}{20}>-\frac{15}{20}=-\frac{3}{4}$
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