1. " a number is less than or equal to -11"

Since -11 is a negative number, any number such as -12,-13,-14, and etc. will be less than -11. Then of course, -11 is equal to -11. I hope this is helpful to you.

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 .

neither accurate nor precise.