Density is defined as mass/volume (or m/v).
So,
(126.0 g)/(12.5 cm^3)= 10.08 g/cm^3
If your teacher requires correct significant figures, the answer is 10.1 g/cm^3.
If not, the first answer is fine.
Answer: 1. rock stone gase from developing the other difference
Accelartion because he said how it reached 80 mph in just 6 seconds