What is 20000+999999999999999999+8888x99999

Use set builder notation to represent the following set: { -3, -2, -1, 0}

One of the same side angles of two parallel lines is 20° smaller than the other one. find the measures of these two angles.

The length of triangle base is 26. a line, which is parallel to the base divides the triangle into two equal area parts. find the length of the segment between triangle legs.