Who is really good in algebra that can me with these lessons?

Does being in 7th grade be counted as being "good in algebra"?

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 "

answer: .64

step-by-step explanation

set up the formula for standard deviation for this set of numbers, then simplify