So yeah im taking a Algebra 1 test on edgunity if anyone could help

The lengths of all sides of a triangle are integers when measured in decimeters. one of the sides has length of 1 dm and another of 3 dm. find the perimeter of the triangle.'

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

You have 12 balloons to blow up for your birthday party. you blow up 1/3, and your friend blows up 5 of them. what fraction of the baloons still need blowing up