I'm truly sorry that this is late!!
My text book question is 27 on 2.4
"The surface area of a cube is 100 cm squared. Determine the edge length of the cube, to the nearest tenth of a centimetre."
A CUBE has 6 faces.
Since I knew that, I divided 100 cm squared by 6 to give me one face.
That got me 16.66 cm squared.
Since I wanted to get rid of the squared, I did a square root of a 16.66.
For that, I got 4.082.
I rounded that to the nearest tenth, and I got 4.1.
I checked at the book, and I got the same answer.