Q$2$:

$F(w,x,y,z)=m(0,2,4,5,6,7,8,10,13,15)$

${}_m$ represents the list of minterm indexes that make the function true $(1)$

For example, $F(w,x,y,z)={\displaystyle \underset{m}{\overset{?}{}}}(2,6,11)$ means $F$ is $1$ when

Minterm index $2$ is true: i$.$e$.,w^{\text{'}}{x}^{\text{'}}y{z}^{\text{'}}=1$

Minterm index $6$ is true: i$.$e$.,w^{\text{'}}xy{z}^{\text{'}}=1$

Minterm index $11$ is true: i$.$e$.,w{x}^{\text{'}}yz=1$

Answer:

PIs: $x^{\text{'}}{z}^{\text{'}},w^{\text{'}}{z}^{\text{'}},w^{\text{'}}x,xz$

EPIs: $x^{\text{'}}{z}^{\text{'}},xz$

Two optimized expressions exist: $(1)F(w,x,y,z)=x^{\text{'}}{z}^{\text{'}}+xz+w^{\text{'}}{z}^{\text{'}}(2)F(w,x,y,z)=x^{\text{'}}{z}^{\text{'}}+xz+w^{\text{'}}x$