which is a revision of an original federal mandate that used incentives and grants to motivate state compliance to regulations regarding the reduction of critical air pollutants​

it is called acid bonding

by cartels in other countries, shipped by air, mail, or land. i cant really see your answer choices : /

hey there!

mass = 6.75 g

volume =   9 cm³

therefore:

d = mass / volume

d   = 6.75 / 9

d = 0.7 g/cm³

answer b