Question

Each row in a window display of floppy disk cartons contains two more boxes than the row above. The first row has one box. Complete the table to find the number of rows in a display containing 81 boxes. Row Number 1 ,2 ,3, 5, 6 Boxes In Row: 1,3,5 Total boxes in Display a. 8 rows C. 9 rows b. 10 rows d. 15 rows

Answer 1

choice c . 9 rows.

Step-by-step explanation:

In the table given, we see that the next row contains 2 more boxes than the previous; therefore, we fill the table as follows.

1 2, 3 4 5 6 7 8 9 10

-------------------------------------------

1 3 5 7 9 11 13 15 17 19

1 4 9 16 25 36 49 64 81 100

Now we have to sum the number boxes as we go along the rows. For example, the sum of the first two rows is

1 + 3 = 4

and so we write 4 at the second row

the sum of first 3 rows is

1 + 3 + 5 = 9

and so on