Multiply the numerators and multiply the denominators.<br><br>&bull; \(\frac{3}{4} \times \frac{4}{9} = \frac{3 \times 4}{4 \times 9} = \frac{12}{36}\)<br>&bull; Simplify \(\frac{12}{36}\): divide numerator and denominator by 12<br>&bull; \(\frac{12}{36} = \frac{1}{3}\)<br><br>Final Answer: A = 1, B = 3