Michael wanted to make another quilt with an area of 42 square feet. what are its possible dimensions of they must be whole numbers? which length and width makes the most sense for a quilt?

The area is the product of the dimensions (length x width).

If the dimensions must be whole numbers and the area is 42 square feet,
then the dimensions can only be . . .

  1-ft  by  42-ft
  2-ft  by  21-ft
  3-ft  by  14-ft
or
  6-ft  by  7-ft .

6-ft  by  7-ft  probably makes the most sense for a quilt.