can someone explain to me how to answer this:

Polycarbonate plastic has a density of 1.2 g/c3. A photo frame is constructed from two 3.0 mm sheets of polycarbonate. Each sheet measures 28 cm by 22cm.What is the mass of the photo frame?

1 answer

Mass = Volume x density
= 28x22x6 cm^3 x 1.2 g/cm^3

The answer will be in grams. Divide it by 1000 for kilograms