The model shows the addition expression 18 + 12. One expression that is equivalent to this sum is _.
A. 3 + 6 + 4
B. 3 (6 + 4)
C. (3 + 6) 4
D. 3 (6) + 4

The height of a box can be found by dividing its volume by the area of its base, bottom. what is the height of a box that has a volume of 26.35 cubic centimeter and a base area of 4 1/4 square centimeter?