1. Calculate Volume of Object.
Initial volume- 7.5mL
Final Volume- 15.8mL
Volume of object _____________
Your question needs amplification. If I interpret it correctly, and I'm guessing since your problem isn't clear, that an object was placed in a solution (probably water in a measuring cup or graduated cylinder) and the volume of the liquid rose from 7.5 to 15.8. If that is correct, the volume of the object is 15.8 - 7.5 = ?? cubic centimeters.
To calculate the volume of the object, you need to find the difference between the final volume and the initial volume.
The formula to find the volume is:
Volume = Final Volume - Initial Volume
Substituting the given values, we have:
Volume = 15.8 mL - 7.5 mL
Volume = 8.3 mL
Therefore, the volume of the object is 8.3 mL.