In triangle cde, two triangles add to be 100 degrees. the third angle must be 80 degrees. true or false?

Let w = 4. enter > , < , or = to compare the expressions. 3w² + 1 10w + 8

In two or more complete sentences, determine the appropriate model for the given data and explain how you made your decision. (1,-1), (2,0.5), (5,1.5), (8,2)

The fence around a quadrilateral-shaped pasture is 3a^2+15a+9 long. three sides of the fence have the following lengths: 5a, 10a-2, a^2-7. what is the length of the fourth side of the fence?