1. Calculate Volume of Object.

Question

Initial volume- 7.5mL

Final Volume- 15.8mL

Volume of object _____________

Answer 1

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.