Im struggling a bit can someone help me :)

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

Order the measurements from the least to the greatest. 2,720 ml , 24.91 l , 0.0268 kl

Hurrya vegetable garden and a surrounding path are shaped like a square that together are 11ft wide. the path is 2ft wide if one bag of gravel covers 9 square feet how many bags are needed to cover the path