Hurryy! : ddd in a 5/6 pound mixture of sand and gravel, 1/4 pound is gravel. how much gravel is there in a 1-pound mixture?

What is the volume of the sphere shown below with a radius of 3?

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20

The area of a rectangle is 10 cm^2. one side of the rectangle is x cm. express the perimeter of the rectangle in terms of x and show that this rectangle cannot have a perimeter of 12 cm. the perimeter of the rectangle in terms of x is __ cm