ElectricPavlov

cuberoot 0.8 = .9283

The AREA the cylinder covers is   pi r^2    multiply this times the HEIGHT to get VOLUME

pi (3^2) x 4 = 113.04 cm^3

Density = mass/volume

75500g/75000= 1.0066667   g/cm^3

e^x =  15    take the ln of both sides

ln (e^x) = ln (15)

x = ln (15) = 2.70805

Trade with your sister.

JUst re-arrange so all of the terms are on one side and equated to zero

6x^2 - 10x -4  = 0  is a Quadratic Equation        Now you can work with it......   simplify it if you want by dividing both sides by 2

3x^2 -5x - 2 = 0            is the same thing.....a Quadrtic Equation    SOme can be solved by simply factoring, others may need the quadratic FORMULA or 'completing the square' to find a solution

There are 2pi radians in 360 degrees         so  180 degrees would be pi radians     90 degrees would be pi/2 radians   45 degrees would be pi/4   radians    etc ....

It is CUBE shaped, so each side is a SQUARE and all of the sides are the same size.

Each side is 11 x 11 = 121 sq cm

There are SIX sides to a cube, so the MINIMUM amount of paper would be   6 x 121  =   726   sq cm of paper

6d - 11/2 = 2d - 13/2     ADD 11/2 to both sides of the equation

6d - 11/2 +11/2 = 2d - 13/2 + 11/2

6d = 2d - 2/2     SUBTRACT 2d from both sides

6d -2d = 2d - 2d - 2/2

4d = -2/2

4d = -1     DIVIDE both sides by 4

d = -1/4 = -.25

Means once a year       One time a  year     365 days