263.25 is the volume of the box in inches cubes you have to multiply 4.5 by 9 by 6.5
4 3/8 is what I believe to be the answer.<span />
Mean number simply means average.
You multiply the denominator on one side of the equation by the numerator and vice versa. So for example(S)I'm going to multiply 4 by nine and 3 times n. Then that comes out to 3n=36. After you multiply, you divide from both sides to get the variable by itself. So you would divide both sides by 3 and you're final answer would be n=13. Hope this helped!
