Ed lined up 10 guitar picks across his desk. each pick was 12 mm wide. how many centimeters long was the line of his guitar picks?

12 centimeters

Step-by-step explanation:

The width of each guitar pick was = 12 mm

He lined up 10 guitar picks across his desk.

The length of line of his guitar picks = 12 × 10

                                                            = 120 mm

Now we will convert 120 mm to centimeter.

10 millimeter = 1 centimeters

120 millimeters =

                         = 12 centimeters.

The line of his guitar picks was 12 centimeters long.