Someone plz help 4x ( 52 - 12)-0

You’re giving a cube with a length of 2.5 cm and a width of 2.5 cm and a high of 2.5 cm you place it on a scale and it is 295 g calculate the density

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9