the first group of 10 children has a mean weight of 15.6 kg, the second group of another 10 children has a mean weight of 16 kg, and the third group of children has a mean weight of 20 kg. if the mean weight of all the children is 17 kg, what is the total number of children in all of the three groups?

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 "

step-by-step explanation:

this can be solved first with pythagorean theorem, which tells us to square both legs of the triangle and sum it. this will be equal to the square of the hypotenuse.

the hypotenuse is the side "opposite" the 90 degree angle, which is x.

so we can write using pythagorean theorem,

simplifying:

to further simplify this radical, we need to use the property  

thus

step-by-step explanation:

oh the deck is the size of my dic k so about 320 inches hope u get my dic k as the answer