Which of the following is an arithmetic sequence? 2, 4, 8, 16, ...
-8, -6, -4, -2, ...
-2, 4, -6, 8, ...

An arithmetic sequence is a sequence in which the same number is repeatedly added is called an arithmetic sequence.

So in order for a sequence to be arithmetic, the difference between consecutive terms must remain constant.

Let's look at the second pattern.

Notice that each time, we add 2 to reach the next term.

The other sequences don't have a common difference.

a net is a diagram that shows a “flattened” view of a solid. in a net, each face and base is shown with all of its dimensions. a net can also serve as a pattern to build a three-dimensional solid.

a pyramid is a three-dimensional object with a base that is a polygon and triangular faces that meet at one vertex.

" the net of a triangular pyramid consists of four triangles. the base here we are given of the pyramid is a equilateral   triangle, and the lateral faces are also triangles "