Whenever finding volume of a simple rectangular prism like that one, simply multiply the Length of one side by the Height of the prism by the Width of the front face and you will get your solution. Length=6 ft, Height=3 ft, Width=4 ft. Hence, V=L*W*H or V=6*4*3=72 cubic feet.
![A = A_{0}*( \frac{1}{2})^(t/t_{\frac{1}{2}) [tex]A= Amount of Substance Left A_{0} = Initial Amount of Substance t = Time Taken t_{\frac{1}{2}} = Half-Life of the Substance](https://tex.z-dn.net/?f=A%20%3D%20A_%7B0%7D%2A%28%20%5Cfrac%7B1%7D%7B2%7D%29%5E%28t%2Ft_%7B%5Cfrac%7B1%7D%7B2%7D%29%20%20%5Btex%5DA%3D%20Amount%20of%20Substance%20Left%20A_%7B0%7D%20%3D%20Initial%20Amount%20of%20Substance%20t%20%3D%20Time%20Taken%20t_%7B%5Cfrac%7B1%7D%7B2%7D%7D%20%3D%20Half-Life%20of%20the%20Substance)