Answer: We have to find the amount of mulch in square feet that would cover the flower bed shape which has the dimensions of 7yd and 4yd:
[tex]\begin{gathered} 7yd=(3\times7)ft=21ft \\ \\ 4yd=(3\times4)ft=12ft \\ \end{gathered}[/tex]Therefore the amount of mulch needed is as follows:
[tex]21ft\times12ft=252ft^2[/tex]