Can someone tell me what “increase s by 2s” is

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

What are the measures of angles a, b, and c? show your work and explain your answers. 25 points

Quadrilateral efgh was dilated with the origin as the center of dilation to create quadrilateral e'f'g'h'. the quadrilateral was dilated using a scale factor of 2.5. the lengths of the sides of quadrilateral efgh are given. what is the length of side f'g'?