Answer:
[tex]\boxed {\boxed {\sf v=12 \ mL}}[/tex]
Explanation:
Grace found the volume of the rock using water displacement.
To calculate the volume, we must subtract the initial volume from the final volume.
[tex]v_f-v_i[/tex]
The initial or original volume is 20 milliliters.
The final or new volume, after the rock is added to the water, is 32 milliliters.
[tex]v_f=32 \ mL\\v_i=20\ mL[/tex]
Substitute the values into the formula and subtract.
[tex]32 \ mL-20 \ mL[/tex]
[tex]12 \ mL[/tex]
The volume of the rock is 12 milliliters.
