Ruby is making earrings for herself and her four best friends as a project. she has a 2.8 cm long rod of pure platinum that she wants to divide into 10 equal pieces and one piece for each earring. in order to get it exactly right, she is going to measure each 0.28 cm long piece in millimeters. how many millimeters long will each piece be?
a. 28 mm
b. 0.028 mm
c. 2.8 mm
d. 0.28 mm
