Answer:
15.75 x¹⁰y¹⁹
Step-by-step explanation:
Fifth term is at r = 4
9C4 × (-y/4)⁴ × (2x²y³)⁵
126 × y⁴/256 × 32x¹⁰y¹⁵
(63/4) x¹⁰y¹⁹
