Sally has a cube of side length units such that the number of square units in the surface area of the cube equals 1/10 of the number of cubic units in the volume. She also wants to make a square for which the number of square units in the area of the square is equal to the number of cubic units in the volume of the cube. What should the side length of the square be?

Guest Nov 8, 2020

#1**+1 **

Sally has a cube of side length units such that the number of square units in the surface area of the cube equals 1/10 of the number of cubic units in the volume. (condition1)

She also wants to make a square for which the number of square units in the area of the square is equal to the number of cubic units in the volume of the cube. (condition2)

What should the side length of the square be?

**Hello Sally!**

**condition1**

\(\color{blue}6a^2=\frac{1}{10}a^3\\ a^3-60a^2=0\\ a^2(a-60=0) \)

\(a=60\)

The cube has a side length of 60 side length units.

**condition2**

\(x^2=y^3\)

\(2log(x)=3log(y)\\ log(y)=\frac{2}{3}log(x)\\ {\color{blue}y=10^{\frac{2}{3}log(x)}}\ |\ \{x,y\} \subset \mathbb N\)

x : 1, 8, 64, 1000 \( side\ length\ units\) square

y : 1, 4, 16, 100 \( side\ length\ units\) cube

The side length of the square is \(\{1, 8, 64, 1000\}\ side\ length\ units.\)

**Condition1 and condition2 are not compatible.**

asinus Nov 10, 2020