What is 9.88 rounded to the nearest tenths

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

Which composition of similarity transformations maps polygon abcd to polygon a'b'c'd'? a dilation with a scale factor less than 1 and then a reflection a dilation with a scale factor less than 1 and then a translation a dilation with a scale factor greater than 1 and then a reflection a dilation with a scale factor greater than 1 and then a translation

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.