Martha baked 18 cupcakes Martha's family ate 12 what percent of the 18 cupcakes did the family eat

What situation is an example of an observational study

Lena reflected this figure across the x-axis. she writes the vertices of the image as a'(−2, 8), b'(−5, 6), c'(−8, 8), d'(−4, 2).

Can some one explain this i got sent this. is this a threat i’m scared