<p><img alt="9. What is the coefficient of r20y80 in the expansion of (7x 3)0 ()720.130 (b)-(W). 720-1380 (e) ) . 780ยท1320 (d3080. 1320 100 100 100" src="https://media.cheggcdn.com/media%2F130%2F130116da-d077-4d0d-9bc8-44632740324f%2FphpOCbhtq.png" style="height:1024px;width:789px;" aria-describedby="d3f"/></p><p>Please show