Question

Math Help? 15 Points

Answer 1

This is a surface area problem but we have to split it into 2 sections.

1. The rectangle bottom part - just remember it doesn't have a top
2. The triangle prism part - remember it doesn't have a bottom

1. SA=2(lw+lh+wh) l=10, w=6, h=5
Plug those in and solve you get 280. But you have to take off the area of the top so area of a rectangle is l*w = 60 280-60=220

2. SA=2$( \frac{1}{2} bh)$+$A_{1} + A_{2} +A _{3}$ of each rectangar side (though in our case we are leaving one off). 
b=6 h=4 A of each is 60. When you plug them all in, leaving one off, you get 124.

220+124=344 so the answer is B

I hope that helps.