Answer:
30t + 30m < 330lb
Explanation:
The problem says maximum of 330 so you would write ___< 330
The topsoil is 30lb per bag (t = topsoil) so it would be 30t (30 times how many top soil bags)
The mulch is also 30lb per bad (m = mulch) so it would be 30m (30 times how many mulch bags)
You have to add them together to get your inequality so that would be:
30t + 30m < 330lb