1. If object A has a mass of 12.96 g and object B has a mass of 5.64 g, what is the combined mass of objects A and B? Report your answer with the correct number of significant digits. Include the proper unit.

(Note that if you enter the correct number with the incorrect significant figures, the problem will be marked as wrong.)

2. The mass of a liquid is being measured by difference. An empty graduated cylinder has a mass of 21.43 g. A quantity of liquid is added to the cylinder. The mass of the cylinder with liquid is equal to 98.72 g. What is the mass of the liquid? Report your value with the correct number of significant digits and the proper unit.

(Note that if you enter the correct number with the incorrect significant figures, the problem will be marked as wrong.)

3.The mass of an unknown object is 36.81 g. Its volume is 2.5 mL. What is its density? Report your value with the correct number of significant digits and the correct unit.

(Note that if you enter the correct number with the incorrect significant figures, the problem will be marked as wrong.)

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