What is the value of y?

A. 50°

B. 30°

C. 60°

D. 400°

D. 40 degrees (I'm assuming you meant 40 not 400)

Step-by-step explanation:

There are 180 degrees in a triangle so we list the angles in an equation:

180 = 50 + 2y + y + 10

Subtract 60 from each side of the equation:

120 = 3y

Divide 3 from each side of the equation:

40 = y  

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 "

7. d. 64

8. i. 32

9. c. 125

10. j. none of the above

11. d. 81

12. i. 216

13. e. none of the above

14. g. 240

15. e. none of the above

16. g. 32

17.   e. none of the above