Solve these problems for me ! asap show all work! 7.24 ÷ 7=? 11.4 ÷ 19?

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

Which questions would most a reader identify the author's purpose for writing? check all that apply. what type of text is this? what type of reviews did the book receive? how many copies of the book have been sold? what is the central idea? how does this text make one feel?

Prove sin2a + cos2a - 1 / sin2a + cos2a + 1 = 1 - tana / 1 + cota