Find the vertex and y-intercept of the quadratic functio. 18. y=-x2 + 6x -8

19. y = x2 - 8x + 11

20. y = 3x2 + 18x + 10

21. y = -2x2 - 12x-5

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:

for volume, add base x height x width