Round the number of connected computers 42,199,279 to the nearest ten million

The expression 6x2 gives the surface area of a cube, and the expression x3 gives the volume of a cube, where x is the length of one side of the cube. find the surface area and the volume of a cube with a side length of 6m

Will give brainliest what is the value of x? enter your answer in the box.

We just started the introduction into circles and i have no idea how to do this.