Translate each statement into a mathematical sentence. Use k as the constant of variation.

1.The volume V of a pyramid varies jointly as the area of the base B and the altitude h.
2 The area A of a triangle varies jointly as the base b and the altitude h.
3.The appropriate length s of a rectangular beam varies jointly as its width w and its depth d.
4.The electrical voltage V varies jointly as the current I and the resistance R.
5.The area A of a triangle varies jointly as the base b and the altitude h of the triangle.​