Sets \( A \) and \( B \) are subsets of the universal set \( U \). These sets are defined as follows. \[ \begin{array}{l}U=\{k, m, q, s, y, z\} \\ A=\{q, z\} \\ B=\{q, y\}\end{array} \] Find the following sets. Write your answer in roster form or as \( \varnothing \). (a) \( A \cup B^{\prime}=\square \) (b) \( A^{\prime} \cap B^{\prime}=\square \)

Cocoa farming in Ghana is supported by specific agricultural practices. What method is most commonly used for drying cocoa beans after fermentation? a. Sun drying combined with artificial heating b. Employing large-scale solar drying panels c. Using mechanized dryers for rapid drying d. Spreading beans in the open air for six days

(ix) The equation \( \frac{1}{r r} \frac{\partial}{r}\left(r \frac{\partial u}{r r}\right)=\frac{1}{c^{2}} \frac{\partial^{2} u}{\partial t^{2}} \) is one dimensional wave equation in: (a) Cylindrical coordinate (b) Polar coordinate (c) Spherical coordinate (d) None of these

A historian is exploring the demographic patterns in West Africa's high forest zone. Which historical factor best explains the hig population density in this area? a. Absence of significant slave raids b. Consistent low temperatures c. Frequent and devastating wars d. Lack of fertile soils for agriculture

Corruption has been a persistent issue in West Africa's governance. What is one reason public officials engage in corruption? a. Widespread support for autocratic governance models b. International organizations encourage the privatization of public services c. Strict enforcement of anti-corruption laws by civil society d. Low salaries, poverty, and greed create incentives for bribery

The ECOWAS Early Warning Mechanism (ECOWARN) plays a critical role in conflict prevention. What is one key function of this system? a. Monitoring and identifying early sign: of conflict in member states b. Facilitating military interventions without UN approval c. Managing arms trade agreements across ECOWAS nations d. Enforcing trade restrictions on countries experiencing conflict