7.1


 * Surface Area and volume

Surface area and volume formulas: rectangular prism:** S = 2lw + 2wh + 2lh V = lwh V = s³
 * Cube:** S = 6s²

Calculating sA/V is finding how much surface area the object has per the amount of volume the object takes up. So the higher the ratio, the more SA the object has per unit volume. [|Surface are to volume site]
 * Sufrace area to volujme ratios:**

Maximizing volume and minimizing surface area is helpful when people wish to store things in boxes. They don't usually want large boxes laying arund in room. http://nimbus.mit.jyu.fi/N4/tutorial/whatis.html
 * Maximizing Volume and minimizing surface Area:**