Hi there!
Let's work side by side on this box to find the surface area. We are going to create an expression for each pair of sides. First, we'll start with the base, which is 15 x 4. And since there are two bases, the expression we get is 2(15 x 4). Next, let's do the front sides. And since there is a front and back side, the expression we get is 2(15 x 25). Lastly, there are the side panels. Again, there are two side panels, the expression we get is 2(4 x 25). Then, we are going to add all of those expressions together to find the total surface area.
WORK:
2(15 x 4) + 2(15 x 25) + 2(4 x 25) = SA
SA = 2(60) + 2(375) + 2(100)
SA = 120 + 750 + 200
SA = 1070cm^2
ANSWER:
1070cm^2
Hope this helps!! :)
If there's anything else that I can help you with, please let me know!
