The expression (10w^3)^2/5w is equivalent to

 2.1    5^2   divided by   5^1   = 5^(2 - 1) = 5^1 = 5

 3.1    w^6 multiplied by w^1 = w^(6 + 1) = w^7

b would be the answer

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .