Please help ASAP. 40 pts

x = 40

Step-by-step explanation:

The sum of the angles of a triangle add to 180 degrees

x+2x+x+20 = 180

Combine like terms

4x+20 =180

Subtract 20 from each side

4x+20-20 =180-20

4x = 160

Divide each side by 4

4x/4 =160/4

x = 40

pentagon

step-by-step explanation:

the coordinates   a(5, -2), b(3,-1),c(-4,-4) d(-3,8) and e(-1,4) forms the vertices of the polygon when they are connected in order.

in order to classify that which polygon is it with the given coordinates, first count the number of vertices and then count the number of sides it can make with these vertices.

since, the given coordinates have five vertices, therefore, it will make five sides. moreover, pentagon is regular in nature therefore it will be convex.

now, a polygon with five sides is known as pentagon, therefore, the given polygon is the pentagon.