---

$\text{a)}A{}^{\prime }=\left(-3,+\infty \right)$  

$B{}^{\prime }=\left(-\infty ,-4\right)\cup ⟨7,+\infty )$  

---

$\text{b)}A\cup B=\left(-\infty ,7\right)$  

---

$\text{c)}A{}^{\prime }\cap B=\left(-3,7\right)$  

---

$\text{d)}B{}^{\prime }-A=⟨7,+\infty )$