Chứng minh một phép đối xứng tầm biên độ đường tròn đơn vị thành đường tròn (C): x²+ y²- 2x + 4y = 0. Tìm tọa độ tâm của phép đối xứng đó.

You and a friend race across a field to a fence and back. your friend has a 50-meter head start. the equations shown represent you and your friend's distances dd (in meters) from the fence tt seconds after the race begins. find the time at which you catch up to your friend. you: d=∣−5t+100∣d=∣−5t+100∣ your friend: d=∣−313t+50∣∣

Will give brainliest sum of arithmetic series (sigma notation) find the numerical answer to the summation given below. (image shown below)

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