Find the lateral area and surface area of the given prism. Round your answer to the nearest whole number.

Question

15 in 17 in 18 in

Answer 1

the prism has three pairs of parallel rectangular faces, right? So the area is
2(15*17 + 15*18 _ 17*18) = _____ in^2

Answer 2

1. Multiple: 15 * 17 = 255
2. Multiple: 15 * 18/17= 15 · 18/1 · 17 = 270/17
3. Then multiply the result of step 2 * 18 = 270/17 * 18 = 270 · 18/17 · 1
= 4860/17
4. Add: the result of step No. 1 + the result of step No. 3 = 255 + 4860/17
= 255/1+ 4860/17 = 255 · 17/1 · 17 + 4860/17 = 4335/17 + 4860/17
= 4335 + 4860/17 = 9195/17
5.Multiple: 2 * the result of step No. 4 = 2 * 9195/17 = 2 · 9195/1 · 17
= 18390/17

Is this how to get the answer or no @oobleck?

Answer 3

oops - my typo
2(15*17 + 15*18 + 17*18)
= 2(255+270+306)
= 2(831)
= 1662

whatever made you think you had to do a division? It was clearly the sum of three rectangles ...