riya obtained the following score (out of 100) in a vocabulary test: 80,85,90,71,60,100. what is her mean score​

If you add all them up you have you get 486 Devi’s that by how many tests she did which is 6. 486/6 = 81

I’m not sure how this works

Answercounterclockwise rotation about the origin by 180 degrees followed by reflection about the y-axisexplanationthe given figure has verticesrecall that for counterclockwise rotation about the origin, when we rotate figure pqrs counterclockwise through an angle of 180° about the origin, the coordinates will becomenext, we reflect in the y-axis by negating the x-coordinates of the resulting figure to obtain,therefore the correct answer is c