The box shown does not have a top. What is the surface area of the box if its length measures 12 cm, its width is 9 cm, and it has a height of 15 cm?
A=w*h
so, ends first:9*15=135cm^2
sides:12*15=180cm^2
bottom:9*12=108cm^2
135+180+108=423cm^2
so, ends first:9*15=135cm^2
sides:12*15=180cm^2
bottom:9*12=108cm^2
135+180+108=423cm^2