A 10 year old boy records the mass of a Rubik's cube has 176 g. Of one side of the cube measures 4 cm, what is the density of the Rubik's cube? PLS HELP! I HAVE A TIME LIMIT!

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

Arrange these numbers from least to greatest 3/5 5/7 2/9

Asquare picture with sides of 32 inches is to be mounted on a square mat with sides of 52 inches. find the area of the mat that will remain uncovered by the picture.