Determine to the correct number of significant figures the mass (mg) of vitamin c in a 78.4 mg sample of a tablet that is 89.5% vitamin c by mass.

our answer should be c

the major pests we deal with are insects, weeds and fungal diseases. a pesticide is a product, whether organic or chemical, used to kill the target pest. there are other techniques gardeners should use that can prevent the severe infestations that make the use of pesticides necessary

one negative thing it that it can kill water animals. another negative thing is it can cause the destruction of ecosystem. one way water pollution can be reduced is to conserve energy.