Phil S. answered • 08/18/19

National Board Certified Teacher of 27 year with AP Reading experience

Start with the basic density formula:

Density = mass / volume

To find volume of a rectangular bar, multiply the length, width, and height:

volume = length x width x height

Combine the two formulas:

density = mass / (length x width x height)

Substitute the values:

density = 45.9 g / (9.4 cm x 3.7 cm x 2.4 cm)

Use your calculator to solve, keeping in mind that since the smallest # of significant digits in your givens is 2, your answer can only have 2:

0.55 g / cm^3