During an experiment, a student determined the mass of an object to be 9.8 g. The actual mass of the object was 10.5. What was the students percent error

Object a has a length of 3 cm, a width of 2 cm, and a height of 4 cm. object b is dropped into a graduated cylinder. it displaces 19 ml of water. the volume of object a is: a: greater than the volume of object b b: less than the volume of object b c: equal to the volume of object b