Is 9x 10 a reasonable way to represent the number of flowers that linnia has left to plant?

Yes, 9x10 is a reasonable way to represent the number of flowers Linnia has left to plant, as it simplifies to 90. This format indicates that she has 9 groups of 10 flowers each, which is a clear and efficient way to convey the total quantity. However, context about whether she actually has that many flowers or if it fits her planting plan would provide more clarity.