If x is the set of negative numbers and y is the set
of positive numbers, then the union of x and y and
0 is the set of
(a) all real numbers
(b) all integers
(c) all rational numbers
(d) all irrational numbers
(e) all odd integers

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 "