If u give me the right answer I’ll give brainlist just plz help

Acircle has a diameter will endpoints of (-2,8) and (6, 4). what is the center of the circle

Abby is preparing fruit punch for her party. she starts with a bowl filled with liquid that has 1/2 fruit juice and 1/2 sprite, but she decides it's too fruity. so she pours out 1/4 of the liquid, and then fills the bowl up again with sprite. what fraction of the punch is now sprite?

How many solutions does the nonlinear system of equations graphed below have?