How many significant figures would be in the reported density D=0.058 g/72.8mL

How many ions that have a +1 charge will bond with an ion that has a -2 charge

The human activities in two locations are described below: location a: rampant use of plastic containers location b: excessive use of pesticides and fertilizers which statement is most likely true? location a will have poor air quality because plastic is biodegradable. location a will experience water scarcity because plastic absorbs moisture. the population of honeybees will increase in location b because production of crops will increase. the population of fish in location b will decrease because the water is contaminated.

Exit what is the density of an object having a mass of 5.0 g and a volume of 45.0 cm3?