Simplify: √125n

Simplify: √216v

Simplify: √512k^2

Simplify: √512m^3

Simplify: √216k^4

Simplify: 3√6-4√6

Simplify: -3√7+4√7

Simplify: -11√21-11√21

Simplify: -9√15+10√15

Simplify: -10√7+12√7

Simplify: 3√12*√6

Simplify: √5*√10

Simplify: √6*√6

Simplify: √5*-4√20

Simplify: -4√15*- √3