## Discrete Mathematics with Applications 4th Edition

a. Yes. No. Yes. No. b. $T=\{(1,-2), (2,-1), (3,0)\}$ c. The domain is $E=\{1,2,3\}$. The codomain is $F=\{-2,-1,0\}$. d.
Be careful of minus signs: $\frac{1-(-2)}{3}=1$, $\frac{2-(-1)}{3}=1$, and $\frac{3-0}{3}=1$.