Few others that i couldn't visualize.
Answer is C. I don't see the side bump sticking way out towards the back in the figure so C doesn't make sense to me.
Answer is D. I don't see where the dotted lines come from...
I wasn't sure between A and C and the answer is C but I don't understand how we can be sure that the two rectangles cross or don't cross in the middle.
Alright for 4
A is the front view which is suppose to look like the back of the object to be correct and the triangle on the side
B is the side view if your looking at it's Length, should be a rectangle, not that shape
C is same as A but with the triangle. I don't think the book has the right answer because it should have the back shape which is a rectangle so i'm not sure what they were smoking when they put it in
D is a top view but as you can see, the triangle does not extend past the back so that's incorrect
E which is close, but the rectangle is too big. If it was the same size as A or C but it's filled to the rectangle, that would be the correct image.
For 21
If you look at the top view, the triangle in the middle is your 3 dotted lines. If your looking at the end view, the first front of the object is shorter then the back which represents a solid line. I believe there should be another dotted line towards the front of the end view to indicate the deep way the middle triangle cuts in.
For 18
Enter text here.If you are looking at the end view, you can see the middle square which represents the left and right side of C. Because it is shorter then the big piece cutting the front view in the middle, you have either options A or C as a choice. Now look at the end view, the diamond shape on the back, because it has a flat surface on the top, that indicates 2 additional lines to show the difference on the top. For A, with no lines, it shows the surface is flat. For C, it shows that there is a difference in surface heights so C it is.
BTW, which test are you using for these questions?