A student knows the width and height of a cereal box. What else
should he measure so he can
calculate the volume?
A. Length
B. Mass
C. Density

Length; volume of a rectangular prism is lwh. If you already know the width and height you still need to find the length.

Most likely a is the answer - because  you generate   38 atp's but also consume an atp.   each atp gives approx. less than 4 kcal so probably a is the closest answer.