Somebody help me with this

30 points ☺️

Simplify 15(x - 4)(x -1)-3(x + 4)(x - 1) with steps

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

Find solution of the linear equation y = 2/3x + 1/3