What will be the new position of point M’(5, -1) after rotating 90 degrees about the origin?

1. what is the measure of ∠abc? what is the measure of ∠abd?

What are the coordinates of the midpoint of ab? ,1/2) /2,-1) ,-3/2) /2,-2)

The weight v of an object on venus varies directly with its weight e on earth. a person weighing 120 lb on earth would weigh 106 lb on venus. how much would a person weighing 150 lb on earth weigh on venus?